1
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Samal B, Voora VK. Modeling Nonresonant X-ray Emission of Second- and Third-Period Elements without Core-Hole Reference States and Empirical Parameters. J Chem Theory Comput 2022; 18:7272-7285. [PMID: 36350224 DOI: 10.1021/acs.jctc.2c00647] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Nonresonant X-ray emission (XE) energies and oscillator strengths are obtained using the effective potential of the generalized Kohn-Sham semi-canonical projected random phase approximation (GKS-spRPA) method. XE energies are estimated as a difference between the valence and core ionization eigenvalues, while the oscillator strengths are obtained within a frozen orbital approximation. This straightforward approach provides accurate XE energies without any need for core-hole reference states, empirical shifting parameters, or tuning of density functionals. To account for relativistic corrections to the core orbitals, we have formulated a scalar relativistic (sr) GKS-spRPA approach based on the spin-free X2C one-electron Hamiltonian. The sr-GKS-spRPA method provides highly reliable XE energies using uncontracted basis-sets on atoms where the core-hole is created prior to emission. For the largest basis-sets used in our study, using completely uncontracted polarized core-valence Dunning basis-sets, the mean absolute errors (MAEs) are within 0.7 eV compared to experimental reference values for a test-set consisting of 27 valence-to-core XE energies of molecules with second- and third-period elements. Considering a balance of accuracy and computational effort, we recommend the use of s-uncontracted def2-TZVP for second-period and all-uncontracted def2-TZVP for third-period elements. For this recommended basis-set, the MAE is 0.2 eV. The analytically continued sr-GKS-spRPA approach, with an O(N4) computational cost, enables efficient computation of XE spectra of molecules such as S8 and C60 with several core-hole states.
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Affiliation(s)
- Bibek Samal
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai400005, India
| | - Vamsee K Voora
- Department of Chemical Sciences, Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai400005, India
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2
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Kamal C, Hauschild D, Seitz L, Steininger R, Yang W, Heske C, Weinhardt L, Odelius M. Coupling Methylammonium and Formamidinium Cations with Halide Anions: Hybrid Orbitals, Hydrogen Bonding, and the Role of Dynamics. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:25917-25926. [PMID: 34868447 PMCID: PMC8634158 DOI: 10.1021/acs.jpcc.1c08932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2021] [Revised: 10/27/2021] [Indexed: 06/13/2023]
Abstract
The electronic structures of four precursors for organic-inorganic hybrid perovskites, namely, methylammonium chloride and iodide, as well as formamidinium bromide and iodide, are investigated by X-ray emission (XE) spectroscopy at the carbon and nitrogen K-edges. The XE spectra are analyzed based on density functional theory calculations. We simulate the XE spectra at the Kohn-Sham level for ground-state geometries and carry out detailed analyses of the molecular orbitals and the electronic density of states to give a thorough understanding of the spectra. Major parts of the spectra can be described by the model of the corresponding isolated organic cation, whereas high-emission energy peaks in the nitrogen K-edge XE spectra arise from electronic transitions involving hybrids of the molecular and atomic orbitals of the cations and halides, respectively. We find that the interaction of the methylammonium cation is stronger with the chlorine than with the iodine anion. Furthermore, our detailed theoretical analysis highlights the strong influence of ultrafast proton dynamics in the core-excited states, which is an intrinsic effect of the XE process. The inclusion of this effect is necessary for an accurate description of the experimental nitrogen K-edge X-ray emission spectra and gives information on the hydrogen-bonding strengths in the different precursor materials.
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Affiliation(s)
- Chinnathambi Kamal
- Department
of Physics, Stockholm University, AlbaNova
University Center, SE-106 91 Stockholm, Sweden
- Theory
and Simulations Laboratory, HRDS, Raja Ramanna Centre for Advanced
Technology, Indore 452013, India
- Homi
Bhabha National Institute, Training School Complex, Anushakti Nagar, Mumbai 400094, India
| | - Dirk Hauschild
- Institute
for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
- Department
of Chemistry and Biochemistry, University
of Nevada Las Vegas (UNLV), Las
Vegas, Nevada 89154-4003, United States
| | - Linsey Seitz
- Institute
for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Department
of Chemical and Biological Engineering, Northwestern University, Evanston, Illinois 60208, United States
| | - Ralph Steininger
- Institute
for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Wanli Yang
- Advanced
Light Source (ALS), Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Clemens Heske
- Institute
for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
- Department
of Chemistry and Biochemistry, University
of Nevada Las Vegas (UNLV), Las
Vegas, Nevada 89154-4003, United States
| | - Lothar Weinhardt
- Institute
for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
- Institute
for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany
- Department
of Chemistry and Biochemistry, University
of Nevada Las Vegas (UNLV), Las
Vegas, Nevada 89154-4003, United States
| | - Michael Odelius
- Department
of Physics, Stockholm University, AlbaNova
University Center, SE-106 91 Stockholm, Sweden
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3
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Sakti AW, Nishimura Y, Nakai H. Recent advances in quantum‐mechanical molecular dynamics simulations of proton transfer mechanism in various water‐based environments. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2020. [DOI: 10.1002/wcms.1419] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Aditya W. Sakti
- Element Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Kyoto Japan
| | - Yoshifumi Nishimura
- Waseda Research Institute for Science and Engineering (WISE) Waseda University Tokyo Japan
| | - Hiromi Nakai
- Element Strategy Initiative for Catalysts and Batteries (ESICB) Kyoto University Kyoto Japan
- Waseda Research Institute for Science and Engineering (WISE) Waseda University Tokyo Japan
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering Waseda University Tokyo Japan
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4
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Zhovtobriukh I, Besley NA, Fransson T, Nilsson A, Pettersson LGM. Relationship between x-ray emission and absorption spectroscopy and the local H-bond environment in water. J Chem Phys 2018; 148:144507. [DOI: 10.1063/1.5009457] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
Affiliation(s)
- Iurii Zhovtobriukh
- FYSIKUM, Stockholm University, Albanova University Center, SE-106 91 Stockholm, Sweden
| | - Nicholas A. Besley
- School of Chemistry, The University of Nottingham, University Park, Nottingham NG72RD, United Kingdom
| | - Thomas Fransson
- Stanford PULSE Institute, SLAC National Accelerator Laboratory, Menlo Park, California 94025,
USA
| | - Anders Nilsson
- FYSIKUM, Stockholm University, Albanova University Center, SE-106 91 Stockholm, Sweden
| | - Lars G. M. Pettersson
- FYSIKUM, Stockholm University, Albanova University Center, SE-106 91 Stockholm, Sweden
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5
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Hitchcock AP. Influence of Local Environment on Inner Shell Excitation Spectra, Studied by Electron and X-ray Spectroscopy and Spectromicroscopy. Z PHYS CHEM 2017. [DOI: 10.1515/zpch-2017-1061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Inner shell excitation spectroscopy is a local probe of the unoccupied electronic structure in the immediate vicinity of the core excited atom. As such, one might expect the inner shell spectrum of a given unit (a molecular fragment or a repeat unit of a solid) to be largely independent of where that unit is located. This is often an implicit assumption in spectral analysis and analytical applications. However, there are situations where inner shell excitation spectra exhibit significant sensitivity to their local environment. Here I categorize the ways in which inner shell spectra are affected by their local environment, and give examples from a career dedicated to developing a better understanding of inner shell excitation spectroscopy, its experimental techniques, and applications.
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Affiliation(s)
- Adam P. Hitchcock
- Department of Chemistry and Chemical Biology , McMaster University , Hamilton, ON L8S 4M1 , Canada , Phone: +1 905 525-9140
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6
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Vaz da Cruz V, Ertan E, Couto RC, Eckert S, Fondell M, Dantz M, Kennedy B, Schmitt T, Pietzsch A, Guimarães FF, Ågren H, Gel'mukhanov F, Odelius M, Föhlisch A, Kimberg V. A study of the water molecule using frequency control over nuclear dynamics in resonant X-ray scattering. Phys Chem Chem Phys 2017; 19:19573-19589. [DOI: 10.1039/c7cp01215b] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a full analysis of the resonant inelastic X-ray scattering spectra of H2O, D2O and HDO.
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7
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Jeyachandran YL, Meyer F, Benkert A, Bär M, Blum M, Yang W, Reinert F, Heske C, Weinhardt L, Zharnikov M. Investigation of the Ionic Hydration in Aqueous Salt Solutions by Soft X-ray Emission Spectroscopy. J Phys Chem B 2016; 120:7687-95. [PMID: 27442708 DOI: 10.1021/acs.jpcb.6b03952] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the molecular structure of the hydration shells and their impact on the hydrogen bond (HB) network of water in aqueous salt solutions is a fundamentally important and technically relevant question. In the present work, such hydration effects were studied for a series of representative salt solutions (NaCl, KCl, CaCl2, MgCl2, and KBr) by soft X-ray emission spectroscopy (XES) and resonant inelastic soft X-ray scattering (RIXS). The oxygen K-edge XES spectra could be described with three components, attributed to initial state HB configurations in pure water, water molecules that have undergone an ultrafast dissociation initiated by the X-ray excitation, and water molecules in contact with salt ions. The behavior of the individual components, as well as the spectral shape of the latter component, has been analyzed in detail. In view of the role of ions in such effects as protein denaturation (i.e., the Hofmeister series), we discuss the ion-specific nature of the hydration shells and find that the results point to a predominant role of anions as compared to cations. Furthermore, we observe a concentration-dependent suppression of ultrafast dissociation in all salt solutions, associated with a significant distortion of intact HB configurations of water molecules facilitating such a dissociation.
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Affiliation(s)
- Y L Jeyachandran
- Angewandte Physikalische Chemie, Universität Heidelberg , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - F Meyer
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - A Benkert
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.,Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT) , Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - M Bär
- Renewable Energy, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH , Hahn-Meitner-Platz 1, 14109 Berlin, Germany.,Institute für Physik und Chemie, Brandenburgische Technische Universität Cottbus-Senftenberg , Platz der Deutschen Einheit 1, 03046 Cottbus, Germany.,Department of Chemistry and Biochemistry, University of Nevada, Las Vegas (UNLV) , 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
| | - M Blum
- Department of Chemistry and Biochemistry, University of Nevada, Las Vegas (UNLV) , 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
| | - W Yang
- Advanced Light Source (ALS), Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, California 94720, United States
| | - F Reinert
- Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - C Heske
- Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT) , Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Department of Chemistry and Biochemistry, University of Nevada, Las Vegas (UNLV) , 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States.,Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT) , Engesserstrasse 18/20, 76028 Karlsruhe, Germany
| | - L Weinhardt
- Institute for Photon Science and Synchrotron Radiation (IPS), Karlsruhe Institute of Technology (KIT) , Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Department of Chemistry and Biochemistry, University of Nevada, Las Vegas (UNLV) , 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States.,Institute for Chemical Technology and Polymer Chemistry (ITCP), Karlsruhe Institute of Technology (KIT) , Engesserstrasse 18/20, 76028 Karlsruhe, Germany
| | - M Zharnikov
- Angewandte Physikalische Chemie, Universität Heidelberg , Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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8
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Nishida N, Tokushima T, Takahashi O. A theoretical study on the pH dependence of X-ray emission spectra for aqueous acetic acid. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.02.063] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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9
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Nishida N, Kanai S, Tokushima T, Horikawa Y, Takahashi O. A theoretical study on the selective oxygen K-edge soft X-ray emission spectroscopy of liquid acetic acid. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.10.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Slavíček P, Winter B, Cederbaum LS, Kryzhevoi NV. Proton-Transfer Mediated Enhancement of Nonlocal Electronic Relaxation Processes in X-ray Irradiated Liquid Water. J Am Chem Soc 2014; 136:18170-6. [DOI: 10.1021/ja5117588] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Petr Slavíček
- Department
of Physical Chemistry, Institute of Chemical Technology, Technická
5, 16628 Prague, Czech Republic
| | - Bernd Winter
- Joint
Laboratory for Ultrafast Dynamics in Solutions and at Interfaces (JULiq), Helmholtz-Zentrum Berlin für Matrialien und Energie, Albert-Einstein-Strasse
15, D-12489 Berlin, Germany
| | - Lorenz S. Cederbaum
- Theoretical
Chemistry, Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
| | - Nikolai V. Kryzhevoi
- Theoretical
Chemistry, Institute of Physical Chemistry, University of Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany
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11
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Jeyachandran YL, Meyer F, Nagarajan S, Benkert A, Bär M, Blum M, Yang W, Reinert F, Heske C, Weinhardt L, Zharnikov M. Ion-Solvation-Induced Molecular Reorganization in Liquid Water Probed by Resonant Inelastic Soft X-ray Scattering. J Phys Chem Lett 2014; 5:4143-4148. [PMID: 26278946 DOI: 10.1021/jz502186a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The molecular structure of liquid water is susceptible to changes upon admixture of salts due to ionic solvation, which provides the basis of many chemical and biochemical processes. Here we demonstrate how the local electronic structure of aqueous potassium chloride (KCl) solutions can be studied by resonant inelastic soft X-ray scattering (RIXS) to monitor the effects of the ion solvation on the hydrogen-bond (HB) network of liquid water. Significant changes in the oxygen K-edge emission spectra are observed with increasing KCl concentration. These changes can be attributed to modifications in the proton dynamics, caused by a specific coordination structure around the salt ions. Analysis of the spectator decay spectra reveals a spectral signature that could be characteristic of this structure.
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Affiliation(s)
- Yekkoni L Jeyachandran
- †Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Frank Meyer
- ‡Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sankaranarayanan Nagarajan
- †Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
| | - Andreas Benkert
- ‡Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- §Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Marcus Bär
- ∥Solar Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
- ⊥Institut für Physik und Chemie, Brandenburgische Technische Universität Cottbus-Senftenberg, Platz der Deutschen Einheit 1, 03046 Cottbus, Germany
- #Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
| | - Monika Blum
- #Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
| | - Wanli Yang
- ∇Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Friedrich Reinert
- ‡Experimentelle Physik VII, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Clemens Heske
- §Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- #Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
- ○ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- ◆Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18/20, 76128 Karlsruhe, Germany
| | - Lothar Weinhardt
- §Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- #Department of Chemistry, University of Nevada, Las Vegas (UNLV), 4505 Maryland Parkway, Las Vegas, Nevada 89154-4003, United States
- ○ANKA Synchrotron Radiation Facility, Karlsruhe Institute of Technology (KIT), Hermann-v.-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- ◆Institute for Chemical Technology and Polymer Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 18/20, 76128 Karlsruhe, Germany
| | - Michael Zharnikov
- †Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany
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12
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Näslund LÅ. Hydrogenation of O and OH on Pt(111): A comparison between the reaction rates of the first and the second hydrogen addition steps. J Chem Phys 2014; 140:104701. [PMID: 24628190 DOI: 10.1063/1.4867535] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- L-Å Näslund
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
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13
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Zhang C, Andersson T, Förstel M, Mucke M, Arion T, Tchaplyguine M, Björneholm O, Hergenhahn U. The photoelectron angular distribution of water clusters. J Chem Phys 2013; 138:234306. [PMID: 23802959 DOI: 10.1063/1.4809748] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Chaofan Zhang
- Department of Physics and Astronomy, Uppsala University, Box 516, 751 20 Uppsala, Sweden
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14
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15
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Blum M, Odelius M, Weinhardt L, Pookpanratana S, Bär M, Zhang Y, Fuchs O, Yang W, Umbach E, Heske C. Ultrafast Proton Dynamics in Aqueous Amino Acid Solutions Studied by Resonant Inelastic Soft X-ray Scattering. J Phys Chem B 2012; 116:13757-64. [DOI: 10.1021/jp302958j] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Blum
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - M. Odelius
- Fysikum, Albanova University Center, Stockholm University, Stockholm, Sweden
| | - L. Weinhardt
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - S. Pookpanratana
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - M. Bär
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Solar Energy Research, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
- Brandenburgische Technische Universität, Cottbus, Germany
| | - Y. Zhang
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
| | - O. Fuchs
- Experimentelle Physik
VII, Universität Würzburg, Würzburg, Germany
| | - W. Yang
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California, United States
| | | | - C. Heske
- Department of Chemistry, University of Nevada, Las Vegas, Nevada,
United States
- Institute for Chemical
Technology and Polymer Chemistry, Karlsruhe Institute of Technology, Karlsruhe, Germany
- ANKA Synchrotron
Radiation Facility, Karlsruhe Institute of Technology, Karlsruhe, Germany
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16
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Kryzhevoi NV, Cederbaum LS. Exploring Protonation and Deprotonation Effects with Auger Electron Spectroscopy. J Phys Chem Lett 2012; 3:2733-2737. [PMID: 26295900 DOI: 10.1021/jz301130t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Auger electron spectroscopy is demonstrated to be a very efficient tool to probe alterations in local chemical environment due to changes in protonation states. We show that electronic and geometric structure changes induced by protonation or deprotonation are well reflected in Auger spectra through characteristic chemical shifts and spectral shape variations. We also present evidence that Auger spectra are sensitive to relative concentrations of compounds in different protonation states. Special attention is paid to the high kinetic energy spectral regions that exhibit remarkable features resulting from core ICD-like transitions in normal species and Auger transitions in deprotonated fragments. The latter contribution was so far ignored when explaining Auger spectra of species embedded in the environment. This contribution should be reconsidered, taking into account the recently discovered possibility of ultrafast dissociation of core-ionized hydrogen-bonded systems in media.
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Affiliation(s)
- Nikolai V Kryzhevoi
- Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, D-69120 Heidelberg, Germany
| | - Lorenz S Cederbaum
- Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, D-69120 Heidelberg, Germany
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17
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Ottosson N, Öhrwall G, Björneholm O. Ultrafast charge delocalization dynamics in aqueous electrolytes: New insights from Auger electron spectroscopy. Chem Phys Lett 2012. [DOI: 10.1016/j.cplett.2012.05.051] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Pokapanich W, Ottosson N, Svensson S, Ohrwall G, Winter B, Björneholm O. Bond Breaking, Electron Pushing, and Proton Pulling: Active and Passive Roles in the Interaction between Aqueous Ions and Water as Manifested in the O 1s Auger Decay. J Phys Chem B 2011; 116:3-8. [PMID: 22107172 DOI: 10.1021/jp2041247] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- W Pokapanich
- Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
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19
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20
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21
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Odelius M. Information Content in O[1s] K-edge X-ray Emission Spectroscopy of Liquid Water. J Phys Chem A 2009; 113:8176-81. [DOI: 10.1021/jp903096k] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael Odelius
- FYSIKUM, Stockholm University, Albanova, S-106 91 Stockholm, Sweden
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22
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High resolution X-ray emission spectroscopy of liquid water: The observation of two structural motifs. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.077] [Citation(s) in RCA: 298] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Nordlund D, Odelius M, Bluhm H, Ogasawara H, Pettersson L, Nilsson A. Electronic structure effects in liquid water studied by photoelectron spectroscopy and density functional theory. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.04.096] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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24
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Fuchs O, Zharnikov M, Weinhardt L, Blum M, Weigand M, Zubavichus Y, Bär M, Maier F, Denlinger JD, Heske C, Grunze M, Umbach E. Isotope and temperature effects in liquid water probed by x-ray absorption and resonant x-ray emission spectroscopy. PHYSICAL REVIEW LETTERS 2008; 100:027801. [PMID: 18232928 DOI: 10.1103/physrevlett.100.027801] [Citation(s) in RCA: 119] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2007] [Indexed: 05/23/2023]
Abstract
High-resolution x-ray absorption and emission spectra of liquid water exhibit a strong isotope effect. Further, the emission spectra show a splitting of the 1b1 emission line, a weak temperature effect, and a pronounced excitation-energy dependence. They can be described as a superposition of two independent contributions. By comparing with gas phase, ice, and NaOH/NaOD, we propose that the two components are governed by the initial state hydrogen bonding configuration and ultrafast dissociation on the time scale of the O 1s core hole decay.
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Affiliation(s)
- O Fuchs
- Universität Würzburg, Experimentelle Physik II, Am Hubland, 97074 Würzburg, Germany.
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25
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Spoel DVD, Maia FRNC, Caleman C. Structural studies of melting on the picosecond time scale. Phys Chem Chem Phys 2008; 10:6344-9. [DOI: 10.1039/b807550f] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Kim E, Kumar R, Weck PF, Cornelius AL, Nicol M, Vogel SC, Zhang J, Hartl M, Stowe AC, Daemen L, Zhao Y. Pressure-Driven Phase Transitions in NaBH4: Theory and Experiments. J Phys Chem B 2007; 111:13873-6. [DOI: 10.1021/jp709840w] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eunja Kim
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Ravhi Kumar
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Philippe F. Weck
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Andrew L. Cornelius
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Malcolm Nicol
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Sven C. Vogel
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Jianzhong Zhang
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Monika Hartl
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Ashley C. Stowe
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Luke Daemen
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
| | - Yusheng Zhao
- Department of Physics and High Pressure Science and Engineering Center, University of Nevada, Las Vegas, Nevada 89154, Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154, Los Alamos Neutron Science Center (LANSCE), Los Alamos, New Mexico 87545, and Savannah River National Laboratory, Aiken, South Carolina 29808
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27
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Elles CG, Shkrob IA, Crowell RA, Bradforth SE. Excited state dynamics of liquid water: Insight from the dissociation reaction following two-photon excitation. J Chem Phys 2007; 126:164503. [PMID: 17477610 DOI: 10.1063/1.2727468] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The authors use transient absorption spectroscopy to monitor the ionization and dissociation products following two-photon excitation of pure liquid water. The primary decay mechanism changes from dissociation at an excitation energy of 8.3 eV to ionization at 12.4 eV. The two channels occur with similar yield for an excitation energy of 9.3 eV. For the lowest excitation energy, the transient absorption at 267 nm probes the geminate recombination kinetics of the H and OH fragments, providing a window on the dissociation dynamics. Modeling the OH geminate recombination indicates that the dissociating H atoms have enough kinetic energy to escape the solvent cage and one or two additional solvent shells. The average initial separation of H and OH fragments is 0.7+/-0.2 nm. Our observation suggests that the hydrogen bonding environment does not prevent direct dissociation of an O-H bond in the excited state. We discuss the implications of our measurement for the excited state dynamics of liquid water and explore the role of those dynamics in the ionization mechanism at low excitation energies.
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Affiliation(s)
- Christopher G Elles
- Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
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28
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Charge Exchange and Fragmentation in Slow Collisions of He2+ with Water Molecules. ADVANCES IN QUANTUM CHEMISTRY 2007. [DOI: 10.1016/s0065-3276(06)52007-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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29
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Zubavichus Y, Zharnikov M, Yang YJ, Fuchs O, Umbach E, Heske C, Grunze M. Oxygen K-edge X-ray absorption fine structure studies of vacuum-deposited ice films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7241-7. [PMID: 16893221 DOI: 10.1021/la060379o] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Multilayer ice films deposited on polycrystalline Au(111) substrates at 90 and 153 K under ultra-high-vacuum conditions are studied using O K-edge X-ray absorption fine structure spectroscopy in the surface-sensitive partial electron yield mode. Both near-edge and extended oscillatory fine structures are analyzed in combination with the theoretical real-space full-multiple-scattering simulations based on the FEFF8 code. The experimental data consistently indicate that the local structure of the near-surface regions in ice films at both substrate temperatures resembles that of high-density crystalline modifications of ice (e.g., ice II, ice III, or high-density amorphous ice). In addition, the ice films deposited at 153 K most probably contain a minor fraction of low-density cubic ice (I(c) phase).
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Affiliation(s)
- Yan Zubavichus
- Angewandte Physikalische Chemie, University of Heidelberg, INF 253, 69120 Heidelberg, Germany.
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30
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Elles CG, Jailaubekov AE, Crowell RA, Bradforth SE. Excitation-energy dependence of the mechanism for two-photon ionization of liquid H2O and D2O from 8.3to12.4eV. J Chem Phys 2006; 125:44515. [PMID: 16942164 DOI: 10.1063/1.2217738] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Transient absorption measurements monitor the geminate recombination kinetics of solvated electrons following two-photon ionization of liquid water at several excitation energies in the range from 8.3 to 12.4 eV. Modeling the kinetics of the electron reveals its average ejection length from the hydronium ion and hydroxyl radical counterparts and thus provides insight into the ionization mechanism. The electron ejection length increases monotonically from roughly 0.9 nm at 8.3 eV to nearly 4 nm at 12.4 eV, with the increase taking place most rapidly above 9.5 eV. We connect our results with recent advances in the understanding of the electronic structure of liquid water and discuss the nature of the ionization mechanism as a function of excitation energy. The isotope dependence of the electron ejection length provides additional information about the ionization mechanism. The electron ejection length has a similar energy dependence for two-photon ionization of liquid D(2)O, but is consistently shorter than in H(2)O by about 0.3 nm across the wide range of excitation energies studied.
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Affiliation(s)
- Christopher G Elles
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, USA
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31
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Takahashi O, Tabayashi K, Wada SI, Sumii R, Tanaka K, Odelius M, Pettersson LGM. Theoretical study of ion desorption from poly-(methyl methacrylate) and poly-(isopropenyl acetate) thin films through core excitation. J Chem Phys 2006; 124:124901. [PMID: 16599719 DOI: 10.1063/1.2176605] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Site-specific chemical reactions following core excitation of poly-(methyl methacrylate) (PMMA) and poly-(isopropenyl acetate) (PiPAc) thin films were investigated. New x-ray absorption spectra of PMMA and PiPAc at the C and O K edges and theoretical spectra within the framework of density functional theory using model molecules were reported, and some new peak assignments were proposed for these spectra. Core-hole excited state molecular dynamics simulations were performed to discuss dissociation dynamics for the target systems, and some specific reaction mechanisms were discussed and explained theoretically; for example, the amount of CH3 ion fragments for PMMA was enhanced at the C and O K edges through the existence of the repulsive sigma*(O-CH3) excited state.
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Affiliation(s)
- Osamu Takahashi
- Department of Chemistry, Hiroshima University, Higashi-Hiroshima 739-8526, Japan.
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32
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Takahashi O, Odelius M, Nordlund D, Nilsson A, Bluhm H, Pettersson LGM. Auger decay calculations with core-hole excited-state molecular-dynamics simulations of water. J Chem Phys 2006; 124:64307. [PMID: 16483207 DOI: 10.1063/1.2166234] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report a new theoretical procedure for calculating Auger decay transition rates including effects of core-hole excited-state dynamics. Our procedure was applied to the normal and first resonant Auger processes of gas-phase water and compared to high-resolution experiments. In the normal Auger decay, calculated Auger spectra were found to be insensitive to the dynamics, while the repulsive character of the first resonant core-excited state makes the first resonantly excited Auger decay spectra depend strongly on the dynamics. The ultrafast dissociation of water upon O(1s)-->4a(1) excitation was analyzed and found to be very sensitive to initial vibrational distortions in the ground state which furthermore affect the excitation energy. Our calculated spectra reproduce the experimental Auger spectra except for the Franck-Condon vibrational structure which is not included in the procedure. We found that the Auger decay of OH and O fragments contributes to the total intensity, and that the contribution from these fragments increases with increasing excitation energy.
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Affiliation(s)
- Osamu Takahashi
- Department of Chemistry, Hiroshima University, Higashi, Japan.
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33
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Ohrwall G, Fink RF, Tchaplyguine M, Ojamäe L, Lundwall M, Marinho RRT, Naves de Brito A, Sorensen SL, Gisselbrecht M, Feifel R, Rander T, Lindblad A, Schulz J, Saethre LJ, Mårtensson N, Svensson S, Björneholm O. The electronic structure of free water clusters probed by Auger electron spectroscopy. J Chem Phys 2005; 123:054310. [PMID: 16108642 DOI: 10.1063/1.1989319] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
(H2O)(N) clusters generated in a supersonic expansion source with N approximately 1000 were core ionized by synchrotron radiation, giving rise to core-level photoelectron and Auger electron spectra (AES), free from charging effects. The AES is interpreted as being intermediate between the molecular and solid water spectra showing broadened bands as well as a significant shoulder at high kinetic energy. Qualitative considerations as well as ab initio calculations explain this shoulder to be due to delocalized final states in which the two valence holes are mostly located at different water molecules. The ab initio calculations show that valence hole configurations with both valence holes at the core-ionized water molecule are admixed to these final states and give rise to their intensity in the AES. Density-functional investigations of model systems for the doubly ionized final states--the water dimer and a 20-molecule water cluster--were performed to analyze the localization of the two valence holes in the electronic ground states. Whereas these holes are preferentially located at the same water molecule in the dimer, they are delocalized in the cluster showing a preference of the holes for surface molecules. The calculated double-ionization potential of the cluster (22.1 eV) is in reasonable agreement with the low-energy limit of the delocalized hole shoulder in the AES.
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Affiliation(s)
- G Ohrwall
- Department of Physics, Uppsala University, P.O. Box 530, SE-751 21 Uppsala, Sweden.
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34
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Odelius M, Ogasawara H, Nordlund D, Fuchs O, Weinhardt L, Maier F, Umbach E, Heske C, Zubavichus Y, Grunze M, Denlinger JD, Pettersson LGM, Nilsson A. Ultrafast core-hole-induced dynamics in water probed by x-ray emission spectroscopy. PHYSICAL REVIEW LETTERS 2005; 94:227401. [PMID: 16090436 DOI: 10.1103/physrevlett.94.227401] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2004] [Indexed: 05/03/2023]
Abstract
The isotope effect and excitation-energy dependence have been measured in the oxygen K-edge x-ray emission spectrum (XES). The use of XES to monitor core decay processes provides information about molecular dynamics (MD) on an ultrafast time scale through the O1s lifetime of a few femtoseconds. Different nuclear masses give rise to differences in the dynamics and the observed isotope effect in XES is direct evidence of the importance of such processes. MD simulations show that even the excitation-energy dependence in the XES is mainly related to differences in core-excited-state dynamics.
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Affiliation(s)
- Michael Odelius
- FYSIKUM, Stockholm University, Albanova, S-106 91 Stockholm, Sweden.
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35
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Nilsson A, Ogasawara H, Cavalleri M, Nordlund D, Nyberg M, Wernet P, Pettersson LGM. The hydrogen bond in ice probed by soft x-ray spectroscopy and density functional theory. J Chem Phys 2005; 122:154505. [PMID: 15945643 DOI: 10.1063/1.1879752] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
We combine photoelectron and x-ray absorption spectroscopy with density functional theory to derive a molecular orbital picture of the hydrogen bond in ice. We find that the hydrogen bond involves donation and back-donation of charge between the oxygen lone pair and the O-H antibonding orbitals on neighboring molecules. Together with internal s-p rehybridization this minimizes the repulsive charge overlap of the connecting oxygen and hydrogen atoms, which is essential for a strong attractive electrostatic interaction. Our joint experimental and theoretical results demonstrate that an electrostatic model based on only charge induction from the surrounding medium fails to properly describe the internal charge redistributions upon hydrogen bonding.
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Affiliation(s)
- A Nilsson
- Stanford Synchrotron Radiation Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
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36
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Felicíssimo VC, Guimarães FF, Gel'mukhanov F, Cesar A, Agren H. The principles of infrared-x-ray pump-probe spectroscopy. Applications on proton transfer in core-ionized water dimers. J Chem Phys 2005; 122:094319. [PMID: 15836140 DOI: 10.1063/1.1860312] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
In this paper we derive the basic physics underlying infrared-x-ray pump-probe spectroscopy (IR, infrared). Particular features of the spectroscopy are highlighted and discussed, such as dependence on phase of the infrared pulse, duration and delay time of the x-ray pulse, and molecular orientation. Numerical applications are carried out for the water dimer using wave packet techniques. It is shown that core ionization of the donor oxygen of the water dimer results in a drastic change of the potential with the global minimum placed in the proton transfer region. The results of the modeling indicate that IR-x-ray pump-probe spectroscopy can be used to study the dynamics of proton transfer in this core-ionized state, and that, contrary to conventional core level photoelectron spectroscopy, x-ray core-ionization driven by an IR field is a proper method to explore the proton transfer in a system like the water dimer. We observe that the trajectory of the nuclear wave packet in the ground state potential well is strongly affected by the absolute phase of the IR pulse.
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Affiliation(s)
- V C Felicíssimo
- Theoretical Chemistry, Roslagstullsbacken 15, Royal Institute of Technology, S-106 91 Stockholm, Sweden.
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