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Yang WC, Busson B, Hore DK. Determining nonlinear optical coefficients of metals by multiple angle of incidence heterodyne-detected sum-frequency generation spectroscopy. J Chem Phys 2020; 152:084708. [DOI: 10.1063/1.5133673] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Wei-Chen Yang
- Department of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
| | - Bertrand Busson
- Université Paris-Saclay, CNRS, Institut de Chimie Physique, UMR 8000, 91405 Orsay, France
| | - Dennis K. Hore
- Department of Chemistry, University of Victoria, Victoria, British Columbia, V8W 3V6, Canada
- Department of Computer Science, University of Victoria, Victoria, British Columbia V8W 3P6, Canada
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Zhu J, Lu C, Cui Y, Zhang C, Lu G. Two-photon resonant hyperpolarizability of an H-shaped molecule studied by wavelength-tunable hyper-Rayleigh scattering. J Chem Phys 2011; 133:244503. [PMID: 21197998 DOI: 10.1063/1.3506421] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Wavelength dependent hyper-Rayleigh scattering measurements have been performed by using a fluorescence spectrometer. With this detection strategy, first molecular hyperpolarizability (β) of a dual charge-transfer (H-shaped) chromophore and its monomer have been measured in two-photon resonance range from 670 to 950 nm as well as at off-resonance of 1064 nm. The absorption and resonance hyper-Rayleigh profiles can be simulated reasonably well with a common set of parameters. In addition, both resonance and off-resonance results show that β(0) per chromophore has a remarkable enhancement for the H-shaped molecule as large as 1.7, compared with that of the monomer, which could be ascribed to two physical effects: (1) coherent enhancement of two chromophores and (2) intramolecular dipole-dipole interaction, which was confirmed by their fluorescence-decay behaviors.
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Affiliation(s)
- Jing Zhu
- Advanced Photonics Center, Southeast University, Nanjing 210096, China
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Ganji MD, Mirnejad A, Najafi A. Theoretical investigation of methane adsorption onto boron nitride and carbon nanotubes. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2010; 11:045001. [PMID: 27877350 PMCID: PMC5090341 DOI: 10.1088/1468-6996/11/4/045001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2009] [Revised: 09/10/2010] [Accepted: 07/21/2010] [Indexed: 05/17/2023]
Abstract
Methane adsorption onto single-wall boron nitride nanotubes (BNNTs) and carbon nanotubes (CNTs) was studied using the density functional theory within the generalized gradient approximation. The structural optimization of several bonding configurations for a CH4 molecule approaching the outer surface of the (8,0) BNNT and (8,0) CNT shows that the CH4 molecule is preferentially adsorbed onto the CNT with a binding energy of -2.84 kcal mol-1. A comparative study of nanotubes with different diameters (curvatures) reveals that the methane adsorptive capability for the exterior surface increases for wider CNTs and decreases for wider BNNTs. The introduction of defects in the BNNT significantly enhances methane adsorption. We also examined the possibility of binding a bilayer or a single layer of methane molecules and found that methane molecules preferentially adsorb as a single layer onto either BNNTs or CNTs. However, bilayer adsorption is feasible for CNTs and defective BNNTs and requires binding energies of -3.00 and -1.44 kcal mol-1 per adsorbed CH4 molecule, respectively. Our first-principles findings indicate that BNNTs might be an unsuitable material for natural gas storage.
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Affiliation(s)
- Masoud Darvish Ganji
- Department of Chemistry, Islamic Azad University, Ghaemshahr Branch, Mazandaran, Iran
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Huttunen MJ, Erkintalo M, Kauranen M. Absolute nonlinear optical probes of surface chirality. ACTA ACUST UNITED AC 2009. [DOI: 10.1088/1464-4258/11/3/034006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Shternin PS, Vasyutinskii OS. The parity-adapted basis set in the formulation of the photofragment angular momentum polarization problem: The role of the Coriolis interaction. J Chem Phys 2008; 128:194314. [DOI: 10.1063/1.2919130] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Siltanen M, Vuorimaa E, Lemmetyinen H, Ihalainen P, Peltonen J, Kauranen M. Nonlinear Optical and Structural Properties of Langmuir−Blodgett Films of Thiohelicenebisquinones. J Phys Chem B 2008; 112:1940-5. [DOI: 10.1021/jp710476k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Mikael Siltanen
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
| | - Elina Vuorimaa
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
| | - Helge Lemmetyinen
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
| | - Petri Ihalainen
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
| | - Jouko Peltonen
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
| | - Martti Kauranen
- Institute of Physics, Tampere University of Technology, Tampere, Finland, Institute of Materials Chemistry, Tampere University of Technology, Tampere, Finland, and Department of Physical Chemistry, Åbo Akademi University, Turku, Finland
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Kuznetsov VV, Vasyutinskii OS. Photofragment angular momentum distribution beyond the axial recoil approximation: Predissociation. J Chem Phys 2007; 127:044308. [PMID: 17672691 DOI: 10.1063/1.2749519] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present the quantum mechanical expressions for the angular momentum distribution of the photofragments produced in slow predissociation. The paper is based on our recent theoretical treatment [J. Chem. Phys. 123, 034307 (2005)] of the recoil angle dependence of the photofragment multipole moments which explicitly treat the role of molecular axis rotation on the electronic angular momentum polarization of the fragments. The electronic wave function of the molecule was used in the adiabatic body frame representation. The rigorous expressions for the fragment state multipoles which have been explicitly derived from the scattering wave function formalism have been used for the case of slow predissociation where a molecule lives in the excited quasibound state much longer than a rotation period. Possible radial nonadiabatic interactions were taken into consideration. The optical excitation of a single rotational branch and the broadband incoherent excitation of all possible rotational branches have been analyzed in detail. The angular momentum polarization of the photofragments has been treated in the high-J limit. The polarization of the photofragment angular momenta predicted by the theory depends on photodissociation mechanism and can in many cases be significant.
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Chichinin AI, Shternin PS, Gödecke N, Kauczok S, Maul C, Vasyutinskii OS, Gericke KH. Intermediate state polarization in multiphoton ionization of HCl. J Chem Phys 2006; 125:34310. [PMID: 16863353 DOI: 10.1063/1.2218336] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The paper presents the detailed theoretical description of the intermediate state polarization and photofragment angular distribution in resonance enhanced multiphoton ionization (REMPI) of molecules and the experimental investigation of these effects in the E(1)Sigma(+) and V(1)Sigma(+) states of HCl populated by two-photon transitions. It is shown that the intermediate state polarization can be characterized by the universal parameter b which is in general a complex number containing information about the symmetry of the two-photon excitation and possible phase shifts. The photofragment angular distribution produced by one- or multiphoton excitation of the polarized intermediate state is presented as a product of the intermediate state axis spatial distribution and the angular distribution of the photofragments from an unpolarized intermediate state. Experiments have been carried out by two complementary methods: REMPI absorption spectroscopy of rotationally resolved (E,v'=0<--X,v"=0) and (V,v'=12<--X,v"=0) transitions and REMPI via the Q(0) and Q(1) rotational transitions followed by three-dimensional ion imaging detection. The values of the parameter b determined from experiment manifest the mostly perpendicular nature of the initial two-photon transition. The experimentally obtained H(+) -ion fragment angular distributions produced via the Q(1) rotational transition show good agreement with theoretical prediction.
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Affiliation(s)
- A I Chichinin
- Institut für Physikalische und Theoretische Chemie, Technische Universität Braunschweig, 38106 Braunschweig, Germany
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Abstract
We review nonlinear optical processes that are specific to chiral molecules in solution and on surfaces. In contrast to conventional natural optical activity phenomena, which depend linearly on the electric field strength of the optical field, we discuss how optical processes that are nonlinear (quadratic, cubic, and quartic) functions of the electromagnetic field strength may probe optically active centers and chiral vibrations. We show that nonlinear techniques open entirely new ways of exploring chirality in chemical and biological systems: The cubic processes give rise to nonlinear circular dichroism and nonlinear optical rotation and make it possible to observe dynamic chiral processes at ultrafast time scales. The quadratic second-harmonic and sum-frequency-generation phenomena and the quartic processes may arise entirely in the electric-dipole approximation and do not require the use of circularly polarized light to detect chirality. They provide surface selectivity and their observables can be relatively much larger than in linear optical activity. These processes also give rise to the generation of light at a new color, and in liquids this frequency conversion only occurs if the solution is optically active. We survey recent chiral nonlinear optical experiments and give examples of their application to problems of biophysical interest.
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Affiliation(s)
- Peer Fischer
- The Rowland Institute at Harvard, Harvard University, Cambridge, Massachusetts 02142, USA.
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Baerends EJ, Gritsenko OV. Away from generalized gradient approximation: Orbital-dependent exchange-correlation functionals. J Chem Phys 2005; 123:62202. [PMID: 16122288 DOI: 10.1063/1.1904566] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The local-density approximation of density functional theory (DFT) is remarkably accurate, for instance, for geometries and frequencies, and the generalized gradient approximations have also made bond energies quite reliable. Sometimes, however, one meets with failure in individual cases. One of the possible routes towards better functionals would be the incorporation of orbital dependence (which is an implicit density dependency) in the functionals. We discuss this approach both for energies and for response properties. One possibility is the use of the Hartree-Fock-type exchange energy expression as orbital-dependent functional. We will argue that in spite of the increasing popularity of this approach, it does not offer any advantage over Hartree-Fock for energies. We will advocate not to apply the separation of exchange and correlation, which is so ingrained in quantum chemistry, but to model both simultaneously. For response properties the energies and shapes of the virtual orbitals are crucial. We will discuss the benefits that Kohn-Sham potentials can offer which are derived from either an orbital-dependent energy functional, including the exact-exchange functional, or which can be obtained directly as orbital-dependent functional. We highlight the similarity of the Hartree-Fock and Kohn-Sham occupied orbitals and orbital energies, and the essentially different meanings the virtual orbitals and orbital energies have in these two models. We will show that these differences are beneficial for DFT in the case of localized excitations (in a small molecule or in a fragment), but are detrimental for charge-transfer excitations. Again, orbital dependency, in this case in the exchange-correlation kernel, offers a solution.
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Affiliation(s)
- E J Baerends
- Section Theoretical Chemistry, Vrije Universiteit, De Boelelaan 1083, 1081 HV Amsterdam, The Netherlands
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Kuznetsov VV, Vasyutinskii OS. Photofragment angular momentum distribution beyond the axial recoil approximation: The role of molecular axis rotation. J Chem Phys 2005; 123:34307. [PMID: 16080737 DOI: 10.1063/1.1953487] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present the quantum-mechanical expressions for the recoil angle dependence of the photofragment multipole moments which explicitly treat the role of molecular axis rotation on the electronic angular momentum polarization of the fragments. The paper generalizes the result of Siebbeles et al. [J. Chem. Phys. 100, 3610 (1994)] to the case of dissociation of rotating molecules. The electronic wave function of the molecule was used in the adiabatic body-frame representation. The obtained rigorous expressions for the fragment state multipoles have been explicitly derived from the scattering wave-function formalism and then simplified using the quasiclassical approximation in the high-J limit. Possible radial and Coriolis nonadiabatic interactions have been taken into consideration. It is shown that the rotation of the molecular axis is described by a number of rotation factors which depend on the rank of the incident-photon polarization matrix, on the dissociation mechanism, and on the classical angle of rotation of the molecular axis gamma.
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