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Fedorov AS, Eremkin EV, Krasnov PO, Gerasimov VS, Ågren H, Polyutov SP. A hybrid quantum-classical theory for predicting terahertz charge-transfer plasmons in metal nanoparticles on graphene. J Chem Phys 2024; 160:044117. [PMID: 38294310 DOI: 10.1063/5.0178247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 01/07/2024] [Indexed: 02/01/2024] Open
Abstract
Metal nanoparticle (NP) complexes lying on a single-layer graphene surface are studied with a developed original hybrid quantum-classical theory using the Finite Element Method (FEM) that is computationally cheap. Our theory is based on the motivated assumption that the carrier charge density in the doped graphene does not vary significantly during the plasmon oscillations. Charge transfer plasmon (CTP) frequencies, eigenvectors, quality factors, energy loss in the NPs and in graphene, and the absorption power are aspects that are theoretically studied and numerically calculated. It is shown the CTP frequencies reside in the terahertz range and can be represented as a product of two factors: the Fermi level of graphene and the geometry of the NP complex. The energy losses in the NPs are predicted to be inversely dependent on the radius R of the nanoparticle, while the loss in graphene is proportional to R and the interparticle distance. The CTP quality factors are predicted to be in the range ∼10-100. The absorption power under CTP excitation is proportional to the scalar product of the CTP dipole moment and the external electromagnetic field. The developed theory makes it possible to simulate different properties of CTPs 3-4 orders of magnitude faster compared to the original FEM or the finite-difference time domain method, providing possibilities for predicting the plasmonic properties of very large systems for different applications.
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Affiliation(s)
- A S Fedorov
- International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - E V Eremkin
- International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - P O Krasnov
- International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - V S Gerasimov
- Institute of Computational Modeling SB RAS, 660036 Krasnoyarsk, Russia
| | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | - S P Polyutov
- International Research Center of Spectroscopy and Quantum Chemistry, Siberian Federal University, 660041 Krasnoyarsk, Russia
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2
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Minaev BF, Panchenko OO, Minaeva VA, Ågren H. Triplet state harvesting and search for forbidden transition intensity in the nitrogen molecule. Front Chem 2022; 10:1005684. [PMID: 36329857 PMCID: PMC9623019 DOI: 10.3389/fchem.2022.1005684] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 09/22/2022] [Indexed: 02/29/2024] Open
Abstract
Triplet excited states of the N2 molecule play an important role in electric discharges through air or liquid nitrogen accompanied by various afterglows. In the rarefied upper atmosphere, they produce aurora borealis and participate in other energy-transfer processes connected with atmospheric photochemistry and nightglow. In this work, we present spin-orbit coupling calculations of the intensity of various forbidden transitions, including the prediction of the electric dipole transition moment of the new1 3 Σ g - ← A 3 Σ u + band, which is strongly prohibited by the (+|-) selection rule, the new spin-induced magneticB ' 3 Σ u - ← A 3 Σ u + transition, magnetic and electric quadrupole transitions for the B3Πg← X 1 Σ g + Wilkinson band, and the Lyman-Birge-Hopfield a1Πg ← X1Σg transition. Also, two other far-UV singlet-singlet quadrupole transitions are calculated for the first time, namely, the Dressler-Lutz a"1Σg +-X1Σg + and the less studied z1Δg-X1Σg + weak transitions.
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Affiliation(s)
- B. F Minaev
- Department of chemistry and nanomaterial sciences, Bohdan Khmelnytsky National University, Cherkasy, Ukraine
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
| | - O. O Panchenko
- Department of chemistry and nanomaterial sciences, Bohdan Khmelnytsky National University, Cherkasy, Ukraine
| | - V. A Minaeva
- Department of chemistry and nanomaterial sciences, Bohdan Khmelnytsky National University, Cherkasy, Ukraine
| | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
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3
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Koulentianos D, Carravetta V, Couto RC, Andersson J, Hult Roos A, Squibb RJ, Wallner M, Eland JHD, Simon M, Ågren H, Feifel R. Formation and relaxation of K −2 and K −2V double-core-hole states in n-butane. J Chem Phys 2022; 157:044306. [DOI: 10.1063/1.5135388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Using a magnetic bottle multi-electron time-of-flight spectrometer in combination with synchrotron radiation, double-core-hole pre-edge and continuum states involving the K-shell of the carbon atoms in n-butane ( n-C4H10) have been identified, where the ejected core electron(s) and the emitted Auger electrons from the decay of such states have been detected in coincidence. An assignment of the main observed spectral features is based on the results of multi-configurational self-consistent field (MCSCF) calculations for the excitation energies and static exchange (STEX) calculations for energies and intensities. MCSCF results have been analyzed in terms of static and dynamic electron relaxation as well as electron correlation contributions to double-core-hole state ionization potentials. The analysis of applicability of the STEX method, which implements the one-particle picture toward the complete basis set limit, is motivated by the fact that it scales well toward large species. We find that combining the MCSCF and STEX techniques is a viable approach to analyze double-core-hole spectra.
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Affiliation(s)
- D. Koulentianos
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
- Laboratoire de Chimie Physique-Matière et Rayonnement, CNRS, Sorbonne Université, Cedex 05, F-75005 Paris, France
| | - V. Carravetta
- Institute of Chemical Physical Processes - CNR, via Moruzzi 1, 56124 Pisa, Italy
| | - R. C. Couto
- Department of Chemistry-Ångström, Uppsala University, Box 538, SE-751 21 Uppsala, Sweden
| | - J. Andersson
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - A. Hult Roos
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - R. J. Squibb
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - M. Wallner
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
| | - J. H. D. Eland
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, Oxford University, South Parks Road, Oxford OX1 3QZ, United Kingdom
| | - M. Simon
- Laboratoire de Chimie Physique-Matière et Rayonnement, CNRS, Sorbonne Université, Cedex 05, F-75005 Paris, France
| | - H. Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, People’s Republic of China
| | - R. Feifel
- Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden
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4
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Carravetta V, Couto RC, Ågren H. X-ray absorption of molecular cations-a new challenge for electronic structure theory. J Phys Condens Matter 2022; 34:363002. [PMID: 35767974 DOI: 10.1088/1361-648x/ac7d2a] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2022] [Accepted: 06/29/2022] [Indexed: 06/15/2023]
Abstract
In this paper we put forward some historical notes on the development of computational chemistry toward applications of x-ray spectroscopies. We highlight some of the important contributions by Enrico Clementi as method and program developer and as a supporter of this branch of computational research. We bring up a modern example based on the very recent experimental development of x-ray absorption of cationic molecules. As we show this spectroscopy poses new challenges for electronic structure theory and the electron correlation problem.
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Affiliation(s)
- V Carravetta
- Institute of Physical Chemical Processes-CNR, via Moruzzi 1, 56124 Pisa, Italy
| | - R C Couto
- Department of Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
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5
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Valiev RR, Nasibullin RT, Cherepanov VN, Baryshnikov GV, Sundholm D, Ågren H, Minaev BF, Kurtén T. First-principles calculations of anharmonic and deuteration effects on the photophysical properties of polyacenes and porphyrinoids. Phys Chem Chem Phys 2020; 22:22314-22323. [PMID: 33020794 DOI: 10.1039/d0cp03231j] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new method for calculating internal conversion rate constants (k[combining low line]IC), including anharmonic effects and using the Lagrangian multiplier technique, is proposed. The deuteration effect on k[combining low line]IC is investigated for naphthalene, anthracene, free-base porphyrin (H2P) and tetraphenylporphyrin (H2TPP). The results show that anharmonic effects are important when calculating k[combining low line]IC for transitions between electronic states that are energetically separated (ΔE) by more than 20 000-25 000 cm-1. Anharmonic effects are also important when ΔE < 20 000-25 000 cm-1 and when the accepting modes are X-H stretching vibrations with a frequency larger than 2000 cm-1. The calculations show that there is mixing between the S1 and S2 states of naphthalene induced by non-adiabatic interactions. The non-adiabatic interaction matrix element between the S1 and S2 states is 250 cm-1 and 50 cm-1 for the normal and fully deuterated naphthalene structure and this difference significantly affects the estimated fluorescence quantum yield. Besides aromatic hydrocarbons H2P and H2TPP, the k[combining low line]IC rate constant is also calculated for pyrometene (PM567) and tetraoxa[8]circulene (4B) with a detailed analysis of the effect of the vibrational anharmonicity.
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Affiliation(s)
- R R Valiev
- University of Helsinki, Department of Chemistry, P.O. Box 55, (A.I. Virtanens plats 1), FIN-00014 University of Helsinki, Finland.
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6
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Banerjee S, Abergel DSL, Ågren H, Aeppli G, Balatsky AV. Interacting Dirac materials. J Phys Condens Matter 2020; 32:405603. [PMID: 32441274 DOI: 10.1088/1361-648x/ab9593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We investigate the extent to which the class of Dirac materials in two-dimensions provides general statements about the behavior of both fermionic and bosonic Dirac quasiparticles in the interacting regime. For both quasiparticle types, we find common features for the interaction induced renormalization of the conical Dirac spectrum. We perform the perturbative renormalization analysis and compute the self-energy for both quasiparticle types with different interactions and collate previous results from the literature whenever necessary. Guided by the systematic presentation of our results in table 1, we conclude that long-range interactions generically lead to an increase of the slope of the single-particle Dirac cone, whereas short-range interactions lead to a decrease. The quasiparticle statistics does not qualitatively impact the self-energy correction for long-range repulsion but does affect the behavior of short-range coupled systems, giving rise to different thermal power-law contributions. The possibility of a universal description of the Dirac materials based on these features is also mentioned.
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Affiliation(s)
- S Banerjee
- Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg Germany. Nordita, KTH Royal Institute of Technology and Stockholm University, Roslagstullsbacken 23, 10691 Stockholm, Sweden. Division of Theoretical Chemistry and Biology, Royal Institute of Technology, SE-10691 Stockholm, Sweden
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7
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Lindblad R, Kjellsson L, Couto RC, Timm M, Bülow C, Zamudio-Bayer V, Lundberg M, von Issendorff B, Lau JT, Sorensen SL, Carravetta V, Ågren H, Rubensson JE. X-Ray Absorption Spectrum of the N_{2}^{+} Molecular Ion. Phys Rev Lett 2020; 124:203001. [PMID: 32501042 DOI: 10.1103/physrevlett.124.203001] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 01/15/2020] [Accepted: 04/08/2020] [Indexed: 06/11/2023]
Abstract
The x-ray absorption spectrum of N_{2}^{+} in the K-edge region has been measured by irradiation of ions stored in a cryogenic radio frequency ion trap with synchrotron radiation. We interpret the experimental results with the help of restricted active space multiconfiguration theory. Spectroscopic constants of the 1σ_{u}^{-1} ^{2}Σ_{u}^{+} state, and the two 1σ_{u}^{-1}3σ_{g}^{-1}1π_{g} ^{2}Π_{u} states are determined from the measurements. The charge of the ground state together with spin coupling involving several open shells give rise to double excitations and configuration mixing, and a complete breakdown of the orbital picture for higher lying core-excited states.
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Affiliation(s)
- R Lindblad
- Department of Physics, Lund University, Box 118, SE-22100 Lund, Sweden
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Inorganic Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
| | - L Kjellsson
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- European XFEL GmbH, Holzkoppel 4, 22869 Schenefeld, Germany
| | - R C Couto
- Theoretical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
- Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - M Timm
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, 10623 Berlin, Germany
| | - C Bülow
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - V Zamudio-Bayer
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
| | - M Lundberg
- Theoretical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, SE-75121 Uppsala, Sweden
| | - B von Issendorff
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - J T Lau
- Abteilung für Hochempfindliche Röntgenspektroskopie, Helmholtz-Zentrum Berlin für Materialien und Energie, Albert-Einstein-Str. 15, 12489 Berlin, Germany
- Physikalisches Institut, Albert-Ludwigs-Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg, Germany
| | - S L Sorensen
- Department of Physics, Lund University, Box 118, SE-22100 Lund, Sweden
| | | | - H Ågren
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
- Theoretical Chemistry and Biology, School of Chemistry, Biotechnology and Health, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, People's Republic of China
| | - J-E Rubensson
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
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8
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Utyushev AD, Isaev IL, Gerasimov VS, Ershov AE, Zakomirnyi VI, Rasskazov IL, Polyutov SP, Ågren H, Karpov SV. Engineering novel tunable optical high-Q nanoparticle array filters for a wide range of wavelengths. Opt Express 2020; 28:1426-1438. [PMID: 32121854 DOI: 10.1364/oe.28.001426] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 11/28/2019] [Indexed: 06/10/2023]
Abstract
The interaction of non-monochromatic radiation with arrays comprising plasmonic and dielectric nanoparticles has been studied using the finite-difference time-domain electrodynamics method. It is shown that LiNbO3, TiO2, GaAs, Si, and Ge all-dielectric nanoparticle arrays can provide a complete selective reflection of an incident plane wave within a narrow spectral line of collective lattice resonance with a Q-factor of 103 or larger at various spectral ranges, while plasmonic refractory TiN and chemically stable Au nanoparticle arrays provide high-Q resonances with moderate reflectivity. Arrays with fixed dimensional parameters make it possible to fine-tune the position of a selected resonant spectral line by tilting the array relative to the direction of the incident radiation. These effects provide grounds for engineering novel selective tunable optical high-Q filters in a wide range of wavelengths, from visible to middle-IR.
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9
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Fedorov AS, Krasnov PO, Visotin MA, Tomilin FN, Polyutov SP, Ågren H. Charge-transfer plasmons with narrow conductive molecular bridges: A quantum-classical theory. J Chem Phys 2019; 151:244125. [PMID: 31893913 DOI: 10.1063/1.5131734] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We analyze a new type of plasmon system arising from small metal nanoparticles linked by narrow conductive molecular bridges. In contrast to the well-known charge-transfer plasmons, the bridge in these systems consists only of a narrow conductive molecule or polymer in which the electrons move in a ballistic mode, showing quantum effects. The plasmonic system is studied by an original hybrid quantum-classical model accounting for the quantum effects, with the main parameters obtained from first-principles density functional theory simulations. We have derived a general analytical expression for the modified frequency of the plasmons and have shown that its frequency lies in the near-infrared (IR) region and strongly depends on the conductivity of the molecule, on the nanoparticle-molecule interface, and on the size of the system. As illustrated, we explored the plasmons in a system consisting of two small gold nanoparticles linked by a conjugated polyacetylene molecule terminated by sulfur atoms. It is argued that applications of this novel type of plasmon may have wide ramifications in the areas of chemical sensing and IR deep tissue imaging.
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Affiliation(s)
- A S Fedorov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - P O Krasnov
- Federal Siberian Research Clinical Center under FMBA of Russia, 660037 Krasnoyarsk, Russia
| | - M A Visotin
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - F N Tomilin
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - S P Polyutov
- Kirensky Institute of Physics, Federal Research Center KSC SB RAS, 660036 Krasnoyarsk, Russia
| | - H Ågren
- Federal Siberian Research Clinical Center under FMBA of Russia, 660037 Krasnoyarsk, Russia
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10
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Zakomirnyi VI, Ershov AE, Gerasimov VS, Karpov SV, Ågren H, Rasskazov IL. Collective lattice resonances in arrays of dielectric nanoparticles: a matter of size. Opt Lett 2019; 44:5743-5746. [PMID: 31774768 DOI: 10.1364/ol.44.005743] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 10/28/2019] [Indexed: 06/10/2023]
Abstract
Collective lattice resonances (CLRs) in finite-sized $ 2D $2D arrays of dielectric nanospheres have been studied via the coupled dipole approximation. We show that even for sufficiently large arrays, up to $ 100 \times 100 $100×100 nanoparticles (NPs), electric or magnetic dipole CLRs may differ significantly from the ones calculated for infinite arrays with the same NP sizes and interparticle distances. The discrepancy is explained by the existence of a sufficiently strong cross-interaction between electric and magnetic dipoles induced at NPs in finite-sized lattices, which is ignored for infinite arrays. We support this claim numerically and propose an analytic model to estimate a spectral width of CLRs for finite-sized arrays. Given that most of the current theoretical and numerical researches on collective effects in arrays of dielectric NPs rely on modeling infinite structures, the reported findings may contribute to thoughtful and optimal design of inherently finite-sized photonic devices.
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11
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Baryshnikov GV, Valiev RR, Cherepanov VN, Karaush-Karmazin NN, Minaeva VA, Minaev BF, Ågren H. Aromaticity and photophysics of tetrasila- and tetragerma-annelated tetrathienylenes as new representatives of the hetero[8]circulene family. Phys Chem Chem Phys 2019; 21:9246-9254. [DOI: 10.1039/c9cp01608b] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure, absorption and emission spectra, aromaticity and photophysical behavior of the recently synthesized tetrasilatetrathia[8]circulene and tetragermatetrathia[8]circulene compounds have been studied computationally.
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Affiliation(s)
- G. V. Baryshnikov
- Division of Theoretical Chemistry and Biology
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- Stockholm
| | - R. R. Valiev
- Research School of Chemistry & Applied Biomedical Sciences
- National Research Tomsk Polytechnic University
- Tomsk 634050
- Russia
- Department of Chemistry
| | | | - N. N. Karaush-Karmazin
- Department of Chemistry and Nanomaterials Science
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
| | - V. A. Minaeva
- Department of Chemistry and Nanomaterials Science
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
| | - B. F. Minaev
- Department of Chemistry and Nanomaterials Science
- Bohdan Khmelnytsky National University
- Cherkasy
- Ukraine
| | - H. Ågren
- Division of Theoretical Chemistry and Biology
- School of Engineering Sciences in Chemistry
- Biotechnology and Health
- KTH Royal Institute of Technology
- Stockholm
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12
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Karaush NN, Minaeva VA, Baryshnikov GV, Minaev BF, Ågren H. Identification of tautomeric intermediates of a novel thiazolylazonaphthol dye - A density functional theory study. Spectrochim Acta A Mol Biomol Spectrosc 2018; 203:324-332. [PMID: 29879648 DOI: 10.1016/j.saa.2018.05.096] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 05/18/2018] [Accepted: 05/27/2018] [Indexed: 06/08/2023]
Abstract
The recently synthesized thiazolylazo dye, 1-[5-benzyl-1,3-thiazol-2-yl)diazenyl]naphthalene-2-ol called shortly BnTAN, is studied by density functional theory (DFT) in three tautomeric forms in order to explain the available 1H NMR, UV-Vis and FTIR spectra. An experimentally observed IR band at 1678 cm-1, assigned to the CO bond stretching vibration, supports the notion that BnTAN retains in the less stable keto-form even in the solid state due to an ultrafast single-coordinate intramolecular proton transfer. This finding is also in a good agreement with an X-ray crystallography analysis which indicates an intermediate position of the proton between the -OH and -N=N- groups. Calculations also show that some experimentally observed 1H NMR signals could be considered as being averaged values between theoretically calculated chemical shifts for the corresponding protons in the keto- and enol-tautomers. At the same time the UV-Vis spectra are almost insensitive to the tautomerization processes as the main single band absorption at 500 nm is present in all tautomers according to our TD DFT simulations. The minor differences in spectral features of the long-wavelength visible region are also noted and discussed with respect to the manifestation of the less stable tautomer form.
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Affiliation(s)
- N N Karaush
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine.
| | - V A Minaeva
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine
| | - G V Baryshnikov
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine; Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - B F Minaev
- Department of Chemistry and Nanomaterials Science, Bohdan Khmelnytsky National University, 18031, Cherkasy, Ukraine; Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - H Ågren
- Division of Theoretical Chemistry and Biology, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden; Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
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13
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Löytynoja T, Harczuk I, Jänkälä K, Vahtras O, Ågren H. Quantum-classical calculations of X-ray photoelectron spectra of polymers-Polymethyl methacrylate revisited. J Chem Phys 2017; 146:124902. [PMID: 28388163 DOI: 10.1063/1.4978941] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we apply quantum mechanics/molecular mechanics (QM/MM) approach to predict core-electron binding energies and chemical shifts of polymers, obtainable via X-ray photoelectron spectroscopy(XPS), using polymethyl methacrylate as a demonstration example. The results indicate that standard parametrizations of the quantum part (basis sets, level of correlation) and the molecular mechanics parts (decomposed charges, polarizabilities, and capping technique) are sufficient for the QM/MM model to be predictive for XPS of polymers. It is found that the polymer environment produces contributions to the XPS binding energies that are close to monotonous with the number of monomer units, totally amounting to approximately an eV decrease in binding energies. In most of the cases, the order of the shifts is maintained, and even the relative size of the differential shifts is largely preserved. The coupling of the internal core-hole relaxation to the polymer environment is found to be weak in each case, amounting only to one or two tenths of an eV. The main polymeric effect is actually well estimated already at the frozen orbital level of theory, which in turn implies a substantial computational simplification. These conclusions are best represented by the cases where the ionized monomer and its immediate surrounding are treated quantum mechanically. If the QM region includes only a single monomer, a couple of anomalies are spotted, which are referred to the QM/MM interface itself and to the neglect of a possible charge transfer.
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Affiliation(s)
- T Löytynoja
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - I Harczuk
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - K Jänkälä
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, FinlandDivision of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden Laboratory for Nonlinear Optics and Spectroscopy, Siberian Federal University, 660041 Krasnoyarsk, Russia
| | - O Vahtras
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - H Ågren
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
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14
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Wikberg C, Westman J, Petersson EL, Larsson MEH, André M, Eggertsen R, Thorn J, Ågren H, Björkelund C. Use of a self-rating scale to monitor depression severity in recurrent GP consultations in primary care - does it really make a difference? A randomised controlled study. BMC Fam Pract 2017; 18:6. [PMID: 28103816 PMCID: PMC5244530 DOI: 10.1186/s12875-016-0578-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2016] [Accepted: 12/26/2016] [Indexed: 11/23/2022]
Abstract
Background Little information is available about whether the use of self-assessment instruments in primary care affects depression course and outcome. The purpose was to evaluate whether using a depression self-rating scale in recurrent person-centred GP consultations affected depression severity, quality of life, medication use, and sick leave frequency. Methods Patients in the intervention group met their GP regularly at least 4 times during the 3 months intervention. In addition to treatment as usual (TAU), patients completed a self-assessment instrument (Montgomery-Asberg Depression Rating Scale) on each occasion, and then GPs used the completed instrument as the basis for a person-centred discussion of changes in depression symptoms. The control group received TAU. Frequency of visits in the TAU arm was the result of the GPs’ and patients’ joint assessments of care need in each case. Depression severity was measured with Beck Depression Inventory-II (BDI-II), quality of life with EQ-5D, and psychological well-being with the General Health Questionnaire-12 (GHQ-12). Data on sick leave, antidepressant and sedatives use, and care contacts were collected from electronic patient records. All variables were measured at baseline and 3, 6, and 12 months. Mean intra-individual changes were compared between the intervention and TAU group. Results There were no significant differences between the intervention and control group in depression severity reduction or remission rate, change in quality of life, psychological well-being, sedative prescriptions, or sick leave during the whole 12-month follow-up. However, significantly more patients in the intervention group continued antidepressants until the 6 month follow-up (86/125 vs 78/133, p < 0.05). Conclusions When GPs used a depression self-rating scale in recurrent consultations, patients more often continued antidepressant medication according to guidelines, compared to TAU patients. However, reduction of depressive symptoms, remission rate, quality of life, psychological well-being, sedative use, sick leave, and health care use 4-12 months was not significantly different from the TAU group. These findings suggest that frequent use of depression rating scales in person-centred primary care consultations has no further additional effect on patients’ depression or well-being, sick leave, or health care use. Trial registration ClinicalTrials.gov Identifier: NCT01402206. Registered June 27 2011(retrospectively registered). Electronic supplementary material The online version of this article (doi:10.1186/s12875-016-0578-9) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- C Wikberg
- Department of Primary Health Care/Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - J Westman
- Division for Family Medicine, Department of Neurobiology, Care Sciences and Society, Karolinska Institutet, Stockholm, Sweden
| | - E-L Petersson
- Department of Primary Health Care/Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Närhälsan Research and Development Primary Health Care, Gothenburg, Sweden
| | - M E H Larsson
- Region Västra Götaland, Närhälsan Research and Development Primary Health Care, Gothenburg, Sweden.,Department of Health and Rehabilitation, Unit of Physiotherapy, Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - M André
- Department of Public Health and Caring Sciences - Family Medicine and Preventive Medicine, Uppsala University, Uppsala, Sweden
| | - R Eggertsen
- Department of Primary Health Care/Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Närhälsan Research and Development Primary Health Care, Gothenburg, Sweden
| | - J Thorn
- Department of Primary Health Care/Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Region Västra Götaland, Närhälsan Research and Development Primary Health Care, Gothenburg, Sweden
| | - H Ågren
- Institute of Neuroscience and Physiology, University of Gothenburg, Gothenburg, Sweden
| | - C Björkelund
- Department of Primary Health Care/Public Health and Community Medicine, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
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15
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Vizlin-Hodzic D, Zhai Q, Illes S, Södersten K, Truvé K, Parris TZ, Sobhan PK, Salmela S, Kosalai ST, Kanduri C, Strandberg J, Seth H, Bontell TO, Hanse E, Ågren H, Funa K. Early onset of inflammation during ontogeny of bipolar disorder: the NLRP2 inflammasome gene distinctly differentiates between patients and healthy controls in the transition between iPS cell and neural stem cell stages. Transl Psychiatry 2017; 7:e1010. [PMID: 28117838 PMCID: PMC5545741 DOI: 10.1038/tp.2016.284] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Accepted: 11/27/2016] [Indexed: 01/09/2023] Open
Abstract
Neuro-inflammation and neuronal communication are considered as mis-regulated processes in the aetiology and pathology of bipolar disorder (BD). Which and when specific signal pathways become abnormal during the ontogeny of bipolar disorder patients is unknown. To address this question, we applied induced pluripotent stem cell (iPSC) technology followed by cortical neural differentiation on adipocyte-derived cells from BD type I patients (with psychotic episodes in psychiatric history) and healthy volunteers (controls). RNA sequencing in iPSC and cortical neural stem cell (NSC) lines were used to examine alterations between the transcriptomes from BD I and control samples during transition from the pluripotent stage towards the neural developmental stage. At the iPSC stage, the most highly significant differentially expressed gene (DEG) was the NLRP2 inflammasome (P=2.66 × 10-10). Also among 42 DEGs at the NSC stage, NLRP2 showed the strongest statistical significance (P=3.07 × 10-19). In addition, we have also identified several cytoskeleton-associated genes as DEGs from the NSC stage, such as TMP2, TAGLN and ACTA2; the former two genes are recognised for the first time to be associated with BD. Our results also suggest that iPSC-derived BD-cortical NSCs carry several abnormalities in dopamine and GABA receptor canonical pathways, underlining that our in vitro BD model reflects pathology in the central nervous system. This would indicate that mis-regulated gene expression of inflammatory, neurotransmitter and cytoskeletal signalling occurs during early fetal brain development of BD I patients.
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Affiliation(s)
- D Vizlin-Hodzic
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Q Zhai
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - S Illes
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden,Oncology Laboratory, Department of Pathology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - K Södersten
- Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - K Truvé
- Bioinformatics Core Facility, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - T Z Parris
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - P K Sobhan
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - S Salmela
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - S T Kosalai
- Institute of Biomedicine, Department of Medical Genetics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - C Kanduri
- Institute of Biomedicine, Department of Medical Genetics, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - J Strandberg
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - H Seth
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - T O Bontell
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden,Department of Clinical Pathology and Cytology, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - E Hanse
- Institute of Neuroscience and Physiology, Department of Physiology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - H Ågren
- Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden,Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska Academy, University of Gothenburg, SE 405 30 Gothenburg, Sweden E-mail:
| | - K Funa
- Sahlgrenska Cancer Center, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden,Oncology Laboratory, Department of Pathology, Sahlgrenska University Hospital, Gothenburg, Sweden,Oncology Laboratory, Department of Pathology, Sahlgrenska University Hospital, SE 413 45 Gothenburg, Sweden. E-mail:
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16
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Affiliation(s)
- R. R. Valiev
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden
- Department of Optics and Spectroscopy, Tomsk State University, Tomsk, Russian Federation
- Department of General Chemistry and Chemical Engineering, Tomsk Polytechnic University, Tomsk, 634050, Russan Federation
| | - J. H. D. Eland
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
- Department of Physics, University of Gothenburg, Gothenburg, Sweden
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, Oxford University, Oxford, United Kingdom
| | - R. Feifel
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
- Department of Physics, University of Gothenburg, Gothenburg, Sweden
| | - H. Ågren
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden
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17
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Gerasimov VS, Ershov AE, Gavrilyuk AP, Karpov SV, Ågren H, Polyutov SP. Suppression of surface plasmon resonance in Au nanoparticles upon transition to the liquid state. Opt Express 2016; 24:26851-26856. [PMID: 27857413 DOI: 10.1364/oe.24.026851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Significant suppression of resonant properties of single gold nanoparticles at the surface plasmon frequency during heating and subsequent transition to the liquid state has been demonstrated experimentally and explained for the first time. The results for plasmonic absorption of the nanoparticles have been analyzed by means of Mie theory using experimental values of the optical constants for the liquid and solid metal. The good qualitative agreement between calculated and experimental spectra support the idea that the process of melting is accompanied by an abrupt increase of the relaxation constants, which depends, beside electron-phonon coupling, on electron scattering at a rising number of lattice defects in a particle upon growth of its temperature, and subsequent melting as a major cause for the observed plasmonic suppression. It is emphasized that observed effect is fully reversible and may underlie nonlinear optical responses of nanocolloids and composite materials containing plasmonic nanoparticles and their aggregates in conditions of local heating and in general, manifest itself in a wide range of plasmonics phenomena associated with strong heating of nanoparticles.
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18
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Löytynoja T, Li X, Jänkälä K, Rinkevicius Z, Ågren H. Quantum mechanics capacitance molecular mechanics modeling of core-electron binding energies of methanol and methyl nitrite on Ag(111) surface. J Chem Phys 2016; 145:024703. [PMID: 27421423 DOI: 10.1063/1.4956449] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We study a newly devised quantum mechanics capacitance molecular mechanics (QMCMM) method for the calculation of core-electron binding energies in the case of molecules adsorbed on metal surfaces. This yet untested methodology is applied to systems with monolayer of methanol/methyl nitrite on an Ag(111) surface at 100 K temperature. It was found out that the studied C, N, and O 1s core-hole energies converge very slowly as a function of the radius of the metallic cluster, which was ascribed to build up of positive charge on the edge of the Ag slab. Further analysis revealed that an extrapolation process can be used to obtain binding energies that deviated less than 0.5 eV against experiments, except in the case of methanol O 1s where the difference was as large as 1.8 eV. Additional QM-cluster calculations suggest that the latter error can be connected to the lack of charge transfer over the QM-CMM boundary. Thus, the results indicate that the QMCMM and QM-cluster methods can complement each other in a holistic picture of molecule-adsorbate core-ionization studies, where all types of intermolecular interactions are considered.
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Affiliation(s)
- T Löytynoja
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - X Li
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - K Jänkälä
- Nano and Molecular Systems Research Unit, University of Oulu, P.O. Box 3000, FIN-90014 Oulu, Finland
| | - Z Rinkevicius
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - H Ågren
- Division of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, SE-106 91 Stockholm, Sweden
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19
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Zagorodskikh S, Vapa M, Vahtras O, Zhaunerchyk V, Mucke M, Eland JHD, Squibb RJ, Linusson P, Jänkälä K, Ågren H, Feifel R. An experimental and theoretical study of core-valence double ionisation of acetaldehyde (ethanal). Phys Chem Chem Phys 2016; 18:2535-47. [PMID: 26700657 DOI: 10.1039/c5cp05758b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Core-valence double ionisation spectra of acetaldehyde (ethanal) are presented at photon energies above the carbon and oxygen 1s ionisation edges, measured by a versatile multi-electron coincidence spectroscopy technique. We use this molecule as a testbed for analyzing core-valence spectra by means of quantum chemical calculations of transition energies. These theoretical approaches range from two simple models, one based on orbital energies corrected by core valence interaction and one based on the equivalent core approximation, to a systematic series of quantum chemical electronic structure methods of increasing sophistication. The two simple models are found to provide a fast orbital interpretation of the spectra, in particular in the low energy parts, while the coverage of the full spectrum is best fulfilled by correlated models. CASPT2 is the most sophisticated model applied, but considering precision as well as computational costs, the single and double excitation configuration interaction model seems to provide the best option to analyze core-valence double hole spectra.
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Affiliation(s)
- S Zagorodskikh
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - M Vapa
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden and Centre for Molecular Materials Research, University of Oulu, P.O. Box 3000, 90014 Oulu, Finland
| | - O Vahtras
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - V Zhaunerchyk
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - M Mucke
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden
| | - J H D Eland
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - R J Squibb
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
| | - P Linusson
- Department of Physics, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
| | - K Jänkälä
- Department of Physics, University of Oulu, 90014 Oulu, Finland
| | - H Ågren
- Department of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology, SE-106 91 Stockholm, Sweden
| | - R Feifel
- Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20 Uppsala, Sweden and Department of Physics, University of Gothenburg, Origovägen 6B, SE-412 96 Gothenburg, Sweden.
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20
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Hayashi A, Le Gal K, Södersten K, Vizlin-Hodzic D, Ågren H, Funa K. Calcium-dependent intracellular signal pathways in primary cultured adipocytes and ANK3 gene variation in patients with bipolar disorder and healthy controls. Mol Psychiatry 2015; 20:931-40. [PMID: 25311363 PMCID: PMC4759096 DOI: 10.1038/mp.2014.104] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 06/11/2014] [Accepted: 07/23/2014] [Indexed: 02/08/2023]
Abstract
Bipolar disorder (BD) is a chronic psychiatric disorder of public health importance affecting >1% of the Swedish population. Despite progress, patients still suffer from chronic mood switches with potential severe consequences. Thus, early detection, diagnosis and initiation of correct treatment are critical. Cultured adipocytes from 35 patients with BD and 38 healthy controls were analysed using signal pathway reporter assays, that is, protein kinase C (PKC), protein kinase A (PKA), mitogen-activated protein kinases (extracellular signal-regulated kinase (ERK) and c-Jun N-terminal kinase (JNK)), Myc, Wnt and p53. The levels of activated target transcriptional factors were measured in adipocytes before and after stimulation with lithium and escitalopram. Variations were analysed in the loci of 25 different single-nucleotide polymorphisms (SNPs). Activation of intracellular signals in several pathways analysed were significantly higher in patients than in healthy controls upon drug stimulation, especially with escitalopram stimulation of PKC, JNK and Myc, as well as lithium-stimulated PKC, whereas no meaningful difference was observed before stimulation. Univariate analyses of contingency tables for 80 categorical SNP results versus diagnoses showed a significant link with the ANK3 gene (rs10761482; likelihood ratio χ(2)=4.63; P=0.031). In a multivariate ordinal logistic fit for diagnosis, a backward stepwise procedure selected ANK3 as the remaining significant predictor. Comparison of the escitalopram-stimulated PKC activity and the ANK3 genotype showed them to add their share of the diagnostic variance, with no interaction (15% of variance explained, P<0.002). The study is cross-sectional with no longitudinal follow-up. Cohorts are relatively small with no medication-free patients, and there are no 'ill patient' controls. It takes 3 to 4 weeks of culture to expand adipocytes that may change epigenetic profiles but remove the possibility of medication effects. Abnormalities in the reactivity of intracellular signal pathways to stimulation and the ANK3 genotype may be associated with pathogenesis of BD. Algorithms using biological patterns such as pathway reactivity together with structural genetic SNP data may provide opportunities for earlier detection and effective treatment of BD.
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Affiliation(s)
- A Hayashi
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - K Le Gal
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - K Södersten
- Sahlgrenska Academy, Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - D Vizlin-Hodzic
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden
| | - H Ågren
- Sahlgrenska Academy, Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska University Hospital, Gothenburg, Sweden,Sahlgrenska Academy, Institute of Neuroscience and Physiology, Section of Psychiatry and Neurochemistry, Sahlgrenska University Hospital, SE 41685 Gothenburg, Sweden. E-mail:
| | - K Funa
- Sahlgrenska Cancer Center, University of Gothenburg, Gothenburg, Sweden,Sahlgrenska Cancer Center, University of Gothenburg, Medicinaregatan 1G, SE 40530 Gothenburg, Sweden. E-mail:
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21
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Löytynoja T, Niskanen J, Jänkälä K, Vahtras O, Rinkevicius Z, Ågren H. Quantum Mechanics/Molecular Mechanics Modeling of Photoelectron Spectra: The Carbon 1s Core–Electron Binding Energies of Ethanol–Water Solutions. J Phys Chem B 2014; 118:13217-25. [DOI: 10.1021/jp506410w] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- T. Löytynoja
- Department
of Physics, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Finland
- Division of Theoretical Chemistry & Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - J. Niskanen
- Department
of Physics, University of Helsinki, P.O. Box 64, FI-00014 University of Helsinki, Finland
| | - K. Jänkälä
- Department
of Physics, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Finland
| | - O. Vahtras
- Division of Theoretical Chemistry & Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
| | - Z. Rinkevicius
- Division of Theoretical Chemistry & Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
- Swedish
e-Science Research Centre (SeRC), KTH Royal Institute of Technology, S-100 44 Stockholm, Sweden
| | - H. Ågren
- Division of Theoretical Chemistry & Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden
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22
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Harczuk I, Murugan NA, Vahtras O, Ågren H. Studies of pH-Sensitive Optical Properties of the deGFP1 Green Fluorescent Protein Using a Unique Polarizable Force Field. J Chem Theory Comput 2014; 10:3492-502. [PMID: 26588314 DOI: 10.1021/ct5001318] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The aim of this study is to identify the responsible molecular forms for the pH dependent optical properties of the deGFP1 green fluorescent protein mutant. We have carried out static and dynamic type calculations for all four protonation states of the chromophore to unravel the contributions due to finite temperature and the flexible protein backbone on the pH dependent optical properties. In particular, we have used a combined molecular dynamics and density functional-molecular mechanics linear response approach by means of which the optical property calculations were carried out for the chromophore in the explicitly treated solvent and bioenvironment. Two different models were used to describe the environment-electronic embedding and polarizable electronic embedding-accounting for the polarization of the chromophore and the mutual polarization between the chromophore and the environment, respectively. For this purpose a polarizable force field was derived quantum mechanically for the protein environment by use of analytical response theory. While the gas-phase calculations for the chromophore predict that the induced red shift going from low to high pH is attributed to the change of molecular forms from neutral to zwitterionic, the two more advanced models that explicitly account for the protein backbone attribute the pH shift to a neutral to anionic conversion. Some ramifications of the results for the use of GFPs as pH sensors are discussed.
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Affiliation(s)
- I Harczuk
- Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , S-106 91 Stockholm, Sweden
| | - N Arul Murugan
- Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , S-106 91 Stockholm, Sweden
| | - O Vahtras
- Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , S-106 91 Stockholm, Sweden
| | - H Ågren
- Division of Theoretical Chemistry and Biology, School of Biotechnology, KTH Royal Institute of Technology , S-106 91 Stockholm, Sweden
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Abstract
Motivated by recent opportunitites to study hollow molecules with multiple core holes offered by X-ray free electron lasers, we revisit the core-hole localization and symmetry breaking problem, now studying ionization of more than one core electron. It is shown, using a N2 molecule with one, two, three, and four core holes, for example, that in a multiconfigurational determination of the core ionization potentials employing a molecular point group with broken inversion symmetry, one particular configuration is sufficient to account for the symmetry breaking relaxation energy in an independent particle approximation in the case of one or three holes, whereas the choice of point group symmetry is unessential for two and four holes. The relaxation energy follows a quadratic dependence on the number of holes in both representations.
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Affiliation(s)
- V Carravetta
- CNR-IPCF, Institute of Chemical and Physical Processes, via G. Moruzzi 1, I-56124 Pisa, Italy.
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Chen X, Rinkevicius Z, Ruud K, Ågren H. Role of zero-point vibrational corrections to carbon hyperfine coupling constants in organic π radicals. J Chem Phys 2013; 138:054310. [PMID: 23406122 DOI: 10.1063/1.4789769] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
By analyzing a set of organic π radicals, we demonstrate that zero-point vibrational corrections give significant contributions to carbon hyperfine coupling constants, in one case even inducing a sign reversal for the coupling constant. We discuss the implications of these findings for the computational analysis of electron paramagnetic spectra based on hyperfine coupling constants evaluated at the equilibrium geometry of radicals. In particular, we note that a dynamical description that involves the nuclear motion is in many cases necessary in order to achieve a semi-quantitatively predictive theory for carbon hyperfine coupling constants. In addition, we discuss the implications of the strong dependence of the carbon hyperfine coupling constants on the zero-point vibrational corrections for the selection of exchange-correlation functionals in density functional theory studies of these constants.
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Affiliation(s)
- X Chen
- KTH Royal Institute of Technology, School of Biotechnology, Division of Theoretical Chemistry and Biology, S-106 91 Stockholm, Sweden
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Abstract
X-ray lasing is predicted to ensue when molecules are pumped into dissociative core-excited states by a free-electron-laser pulse. The lasing is due to the population inversion created in the neutral dissociation product, and the process features self-trapping of the x-ray pulse at the gain ridge. Simulations performed for the HCl molecule pumped at the 2p(1/2)→6σ resonance demonstrate that the scheme can be used to create ultrashort coherent x-ray pulses.
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Affiliation(s)
- Q Miao
- Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Technology, S-106 91 Stockholm, Sweden.
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Baryshnikov GV, Minaev BF, Minaeva VA, Podgornaya AT, Ågren H. Application of Bader’s atoms in molecules theory to the description of coordination bonds in the complex compounds of Ca2+ and Mg2+ with methylidene rhodanine and its anion. RUSS J GEN CHEM+ 2012. [DOI: 10.1134/s1070363212070122] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Abstract
The relativistic behavior of graphene structures, starting from the fundamental building blocks--the poly-aromatic hydrocarbons (PAHs) along with other PAH nanographenes--is studied to quantify any associated intrinsic magnetism in the triplet (T) state and subsequently in the ground singlet (S) state with account of possible S-T mixture induced by spin-orbit coupling (SOC). We employ a first principle quantum chemical-based approach and density functional theory (DFT) for a systematic treatment of the spin-Hamiltonian by considering both the spin-orbit and spin-spin interactions as dependent on different numbers of benzene rings. We assess these relativistic spin-coupling phenomena in terms of splitting parameters which cause magnetic anisotropy in absence of external perturbations. Possible routes for changes in the couplings in terms of doping and defects are also simulated and discussed. Accounting for the artificial character of the broken-symmetry solutions for strong spin polarization of the so-called "singlet open-shell" ground state in zigzag graphene nanoribbons predicted by spin-unrestricted DFT approaches, we interpolate results from more sophisticated methods for the S-T gaps and spin-orbit coupling (SOC) integrals and find that these spin interactions become weak as function of size and increasing decoupling of electrons at the edges. This leads to reduced electron spin-spin interaction and hence almost negligible intrinsic magnetism in the carbon-based PAHs and carbon nanographene fragments. Our results are in agreement with the fact that direct experimental evidence of edge magnetism in pristine graphene has been reported so far. We support the notion that magnetism in graphene only can be ascribed to structural defects or impurities.
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Affiliation(s)
- S Perumal
- KTH Royal Institute of Technology, School of Biotechnolgy, Department of Theoretical Chemistry and Biology, Roslagstullsbacken 15, SE-114 21 Stockholm, Sweden.
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Selvaraj S, Arul Murugan N, Ågren H. Al3+ induced planarization, conformational arrest and metallochromic shift in a pyrimidine dione dye: insight from integrated hybrid quantum–classical calculations. Phys Chem Chem Phys 2012; 14:2339-45. [DOI: 10.1039/c2cp23238c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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de Almeida KJ, Ramalho. TC, Rinkevicius Z, Vahtras O, Ågren H, Cesar A. Theoretical Study of Specific Solvent Effects on the Optical and Magnetic Properties of Copper(II) Acetylacetonate. J Phys Chem A 2011; 115:1331-9. [DOI: 10.1021/jp109826p] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- K. J. de Almeida
- Departamento de Química, Universidade Federal de Lavras, CP 3037, Lavras, MG, Brasil
| | - T. C. Ramalho.
- Departamento de Química, Universidade Federal de Lavras, CP 3037, Lavras, MG, Brasil
| | - Z. Rinkevicius
- Department of Theoretical Chemistry, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - O. Vahtras
- Department of Theoretical Chemistry, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - H. Ågren
- Department of Theoretical Chemistry, Royal Institute of Technology, SE-10691 Stockholm, Sweden
| | - A. Cesar
- Departamento de Química, Universidade Federal de Minas Gerais, Avenida Antonio Carlos, 6627, CEP-31270-901, Belo Horizonte, Minas Gerais, Brasil
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Perumal SS, Minaev B, Vahtras O, Ågren H. Spin–spin coupling in 3b2 state of oxyallyl – A comparative study with trimethylenemethane. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2010.09.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Vall-llosera G, Gao B, Kivimäki A, Coreno M, Álvarez Ruiz J, de Simone M, Ågren H, Rachlew E. Erratum: “The C 1s and N 1s near edge x-ray absorption fine structure spectra of five azabenzenes in the gas phase” [J. Chem. Phys. 128, 044316 (2008)]. J Chem Phys 2009. [DOI: 10.1063/1.3108589] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Vall-llosera G, Gao B, Kivimäki A, Coreno M, Álvarez Ruiz J, de Simone M, Ågren H, Rachlew E. Publisher’s Note: “The C1s and N1s near edge x-ray absorption fine structure spectra of five azabenzenes in the gas phase” [J. Chem. Phys. 128, 044316 (2008)]. J Chem Phys 2008. [DOI: 10.1063/1.2898871] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Vall-llosera G, Gao B, Kivimäki A, Coreno M, Álvarez Ruiz J, de Simone M, Ågren H, Rachlew E. The C 1s and N 1s near edge x-ray absorption fine structure spectra of five azabenzenes in the gas phase. J Chem Phys 2008; 128:044316. [DOI: 10.1063/1.2822985] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ågren H, Reineck I, Veenhuizen H, Maripuu R, Arneberg R, Karlsson L. A theoretical investigation of the U.V. excited 1 A 1→2 A 1 photoelectron spectra of NH3 and ND3. Mol Phys 2006. [DOI: 10.1080/00268978200100381] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- H. Ågren
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
- b Department of Physical Chemistry 2 , Kemicentrum , S-220 07 , Lund , Sweden
| | - I. Reineck
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
| | - H. Veenhuizen
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
| | - R. Maripuu
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
| | - R. Arneberg
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
- c Department of Chemistry , University of Bergen , N-5014 , Bergen , Norway
| | - L. Karlsson
- a Institute of Physics, Uppsala University , S-751 21 , Uppsala , Sweden
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Maripuu R, Reineck I, Ågren H, Wu Nian-Zu, Ji Ming Rong, Veenhuizen H, Al-Shamma S, Karlsson L, Siegbahn K. The HeI excited electron spectrum of phosphine. Mol Phys 2006. [DOI: 10.1080/00268978300100901] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Felicı́ssimo V, Minkov I, Guimarães F, Gel’mukhanov F, Cesar A, Ågren H. A theoretical study of the role of the hydrogen bond on core ionization of the water dimer. Chem Phys 2005. [DOI: 10.1016/j.chemphys.2004.12.006] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Birgerson J, Keil M, Luo Y, Svensson S, Ågren H, Salaneck W. A study of the electronic structure of ethylenedioxythiophene in gas phase using NEXAFS and quantum chemical calculations. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2004.05.054] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ehnvall A, Sjögren M, Zachrisson O, Ågren H. HPA axis activation in patients with few versus multiple episodes of depression. Eur Psychiatry 2002. [DOI: 10.1016/s0924-9338(02)80575-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Sałek P, Carravetta V, Gel’mukhanov F, Ågren H. Theory and first principles calculations of dissociative resonant photoionization: The evolution of atomic peaks and holes. J Chem Phys 2002. [DOI: 10.1063/1.1423329] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Jansik B, Schimmelpfennig B, Norman P, Mochizuki Y, Luo Y, Ågren H. Size, Order, and Dimensional Relations for Silicon Cluster Polarizabilities. J Phys Chem A 2001. [DOI: 10.1021/jp012654f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- B. Jansik
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
| | - B. Schimmelpfennig
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
| | - P. Norman
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
| | - Y. Mochizuki
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
| | - Y. Luo
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
| | - H. Ågren
- Theoretical Chemistry, Royal Institute of Technology, SCFAB, S-106 91 Stockholm, Sweden, Institute of Physics and Measurement Technology, Linköping University, S-58183 Linköping, Sweden, and CCSE, Japan Atomic Energy Research Institute, Nakameguro 2-2-54, Meguro-ku 153-0061, Tokyo, Japan
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Kolczewski C, Püttner R, Plashkevych O, Ågren H, Staemmler V, Martins M, Snell G, Schlachter AS, Sant’Anna M, Kaindl G, Pettersson LGM. Detailed study of pyridine at the C 1sand N 1sionization thresholds: The influence of the vibrational fine structure. J Chem Phys 2001. [DOI: 10.1063/1.1397797] [Citation(s) in RCA: 226] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sałek P, Carravetta V, Gel'mukhanov F, Ågren H, Schimmelpfennig B, Piancastelli MN, Sorensen L, Feifel R, Hjelte I, Bässler M, Svensson S, Björneholm O, Naves de Brito A. Dynamical suppression of atomic peaks in resonant dissociative photoemission. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00667-4] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Luo Y, Ågren H, Keil M, Friedlein R, Salaneck W. A theoretical investigation of the near-edge X-ray absorption spectrum of hexa-peri-hexabenzocoronene. Chem Phys Lett 2001. [DOI: 10.1016/s0009-2614(01)00181-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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