1
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Franke PR, Stanton JF. Rotamers of Methanediol: Composite Ab Initio Predictions of Structures, Frequencies, and Rovibrational Constants. J Phys Chem A 2023; 127:924-937. [PMID: 36657011 DOI: 10.1021/acs.jpca.2c06686] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Geminal diols are known to be important intermediates in atmospheric ozonolysis and the aerosol cycle. Recently, the simplest member of this class, methanediol, was interrogated in the gas phase with infrared spectroscopy. To aid in future spectroscopic investigations of methanediol, including in the interstellar medium, we report fundamental frequencies and rovibrational constants for the two rotamers of this molecule using ab initio composite methods along with vibrational perturbation theory. Sensitivity of the predictions to the level of theory and the treatment of anharmonic resonances are carefully assessed. The OH stretching harmonic frequencies of both rotamers are particularly sensitive to the level of theory. The CH stretches of the Cs rotamer are sensitive to the treatment of anharmonic resonances with VPT2-based effective Hamiltonian models. Equilibrium bond distances and harmonic frequencies are converged conservatively to within 0.0005 Å and 3 cm-1, respectively. The effect of tunneling on the rotational constants is investigated with a 2D variational calculation, based on a relaxed hydroxyl torsional potential energy surface. Tunneling is found to be negligible in the lower energy C2 rotamer but should modify the rotational constants of the Cs rotamer on the order of MHz, giving rise to rotational line splittings of the same order. The rovibrational constants of the Cs rotamer are dominated by hydroxyl torsional effects, and here we see evidence for the breakdown of vibrational perturbation theory.
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Affiliation(s)
- Peter R Franke
- Department of Chemistry, University of Florida, Gainesville, Florida32611, United States
| | - John F Stanton
- Department of Chemistry, University of Florida, Gainesville, Florida32611, United States
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2
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McCoy AB, Boyer MA. Exploring Expansions of the Potential and Dipole Surfaces Used for Vibrational Perturbation Theory. J Phys Chem A 2022; 126:7242-7249. [PMID: 36194755 DOI: 10.1021/acs.jpca.2c05792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A scheme for evaluating expansions of the potential and dipole moment surfaces for vibrational perturbation theory is described. The approach is based on numerical differentiation of the Hessian in the coordinates of interest. It is shown that performing these calculations in internal coordinates generates expansions that are transferable among isotopologues of the molecule of interest. Additionally, re-expressing the expansion of the potential in terms of functions of the internal coordinates, for example, cosines of angles or exponential functions of the bond length displacements, provides expansions that can be used for higher-order perturbation theory calculations. The approach is explored and the results are discussed for water, HOD, ammonia, isomers of HNO3, and halogenated methane.
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Affiliation(s)
- Anne B McCoy
- Department of Chemistry, University of Washington, Seattle, Washington98195, United States
| | - Mark A Boyer
- Department of Chemistry, University of Washington, Seattle, Washington98195, United States
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3
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Tyuterev V, Tashkun S, Rey M, Nikitin A. High-order contact transformations of molecular Hamiltonians: general approach, fast computational algorithm and convergence of ro-vibrational polyad models. Mol Phys 2022. [DOI: 10.1080/00268976.2022.2096140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Affiliation(s)
- Vladimir Tyuterev
- Groupe de Spectrométrie Moléculaire et Atmosphérique, Université de Reims, Reims, France
- Laboratory of Molecular Quantum Mechanics and Radiative Transfer, Tomsk State University, Tomsk, Russia
| | - Sergey Tashkun
- Laboratory of Theoretical Spectroscopy, V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
| | - Michael Rey
- Groupe de Spectrométrie Moléculaire et Atmosphérique, Université de Reims, Reims, France
| | - Andrei Nikitin
- Laboratory of Theoretical Spectroscopy, V.E. Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, Russia
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4
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Carrington T. Using collocation to study the vibrational dynamics of molecules. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 248:119158. [PMID: 33218875 DOI: 10.1016/j.saa.2020.119158] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Accepted: 10/26/2020] [Indexed: 06/11/2023]
Abstract
In this paper, I review collocation methods for solving the time-independent and the time-dependent Schroedinger equation. Unlike traditional variational methods, collocation methods do not require integrals and quadrature. Either collocation or quadrature is necessary if the potential does not have a special form. If the basis is a direct product of univariate bases and the quadrature grid is also a direct product, there exist variational methods that do not require quadrature approximations for potential energy matrix elements. These methods, however, do require storing, in computer memory, vectors with as many components as there are quadrature points. For this reason direct-product variational methods are poor for problems with more than five atoms. There are well established ideas for reducing the size of the basis in a variational calculation. Three such ideas are: 1) prune the direct product basis; 2) use basis functions that are products of multivariate functions; 3) optimise the basis functions (e.g. Multiconfiguration time-dependent Hartree). Reducing the basis size, however, is not enough to the make variational methods tractable because, for all three of these ideas, quadrature rears its ugly head. Collocation is an attractive alternative to variational methods.
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Affiliation(s)
- Tucker Carrington
- Department of Chemistry, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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5
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Vogt E, Bertran Valls P, Kjaergaard HG. Accurate Calculations of OH-Stretching Intensities with a Reduced-Dimensional Local Mode Model Including Eckart Axis Embedding. J Phys Chem A 2020; 124:932-942. [DOI: 10.1021/acs.jpca.9b10682] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Emil Vogt
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø Copenhagen, Denmark
| | - Pablo Bertran Valls
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø Copenhagen, Denmark
| | - Henrik G. Kjaergaard
- Department of Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø Copenhagen, Denmark
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6
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Sibert EL. Modeling vibrational anharmonicity in infrared spectra of high frequency vibrations of polyatomic molecules. J Chem Phys 2019; 150:090901. [DOI: 10.1063/1.5079626] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Edwin L. Sibert
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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7
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Márquez-Mijares M, Roncero O, Villarreal P, González-Lezana T. Theoretical methods for the rotation–vibration spectra of triatomic molecules: distributed Gaussian functions compared with hyperspherical coordinates. INT REV PHYS CHEM 2018. [DOI: 10.1080/0144235x.2018.1514187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Maykel Márquez-Mijares
- Instituto Superior de Tecnologías y Ciencias Aplicadas InsTec, Havana University, Quinta de los Molinos, Havana, Cuba
| | - Octavio Roncero
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
| | - Pablo Villarreal
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
| | - Tomás González-Lezana
- Instituto de Física Fundamental, Consejo Superior de Investigaciones Científicas IFF-CSIC, Madrid, Spain
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8
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Gong JZ, Matthews DA, Changala PB, Stanton JF. Fourth-order vibrational perturbation theory with the Watson Hamiltonian: Report of working equations and preliminary results. J Chem Phys 2018; 149:114102. [DOI: 10.1063/1.5040360] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Justin Z. Gong
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, USA
| | - Devin A. Matthews
- Institute for Computational Engineering and Sciences, The University of Texas, Austin, Texas 78712, USA
| | - P. Bryan Changala
- JILA, National Institute of Standards and Technology, University of Colorado, Boulder, Colorado 80309, USA and Department of Physics, University of Colorado, Boulder, Colorado 80309, USA
| | - John F. Stanton
- Quantum Theory Project, University of Florida, Gainesville, Florida 32611, USA
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9
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Krasnoshchekov SV, Schutski RS, Craig NC, Sibaev M, Crittenden DL. Comparing the accuracy of perturbative and variational calculations for predicting fundamental vibrational frequencies of dihalomethanes. J Chem Phys 2018; 148:084102. [DOI: 10.1063/1.5020295] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sergey V. Krasnoshchekov
- Department of Chemistry, Lomonosov Moscow State University, Leninskiye Gory 1-3, Moscow 119991, Russian Federation
| | | | - Norman C. Craig
- Department of Chemistry and Biochemistry, Oberlin College, Oberlin, Ohio 44074, USA
| | - Marat Sibaev
- Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia
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10
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Bulik IW, Frisch MJ, Vaccaro PH. Fixed-Node, Importance-Sampling Diffusion Monte Carlo for Vibrational Structure with Accurate and Compact Trial States. J Chem Theory Comput 2018; 14:1554-1563. [DOI: 10.1021/acs.jctc.8b00016] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ireneusz W. Bulik
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
| | - Michael J. Frisch
- Gaussian, Inc., 340 Quinnipiac St. Bldg. 40, Wallingford, Connecticut 06492, United States
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, United States
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11
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Bulik IW, Frisch MJ, Vaccaro PH. Vibrational self-consistent field theory using optimized curvilinear coordinates. J Chem Phys 2017; 147:044110. [DOI: 10.1063/1.4995440] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ireneusz W. Bulik
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, USA
| | - Michael J. Frisch
- Gaussian, Inc., 340 Quinnipiac St. Bldg. 40, Wallingford, Connecticut 06492, USA
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, New Haven, Connecticut 06511, USA
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12
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Szalay V. Eckart ro-vibrational Hamiltonians via the gateway Hamilton operator: Theory and practice. J Chem Phys 2017; 146:124107. [DOI: 10.1063/1.4978686] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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13
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Manzhos S, Carrington T. Using an internal coordinate Gaussian basis and a space-fixed Cartesian coordinate kinetic energy operator to compute a vibrational spectrum with rectangular collocation. J Chem Phys 2016; 145:224110. [DOI: 10.1063/1.4971295] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Sergei Manzhos
- Department of Mechanical Engineering, National University of Singapore, Block EA #07-08, 9 Engineering Drive 1, 117576 Singapore
| | - Tucker Carrington
- Chemistry Department, Queen’s University, Kingston, Ontario K7L 3N6, Canada
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14
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Kłos J, Alexander MH, Kumar P, Poirier B, Jiang B, Guo H. New ab initio adiabatic potential energy surfaces and bound state calculations for the singlet ground X̃1A1 and excited C̃1B2(21A′) states of SO2. J Chem Phys 2016; 144:174301. [DOI: 10.1063/1.4947526] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jacek Kłos
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
| | - Millard H. Alexander
- Department of Chemistry and Biochemistry and Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 20742, USA
| | - Praveen Kumar
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
| | - Bill Poirier
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, USA
| | - Bin Jiang
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA
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15
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Lauvergnat D, Luis JM, Kirtman B, Reis H, Nauts A. Numerical and exact kinetic energy operator using Eckart conditions with one or several reference geometries: Application to HONO. J Chem Phys 2016; 144:084116. [DOI: 10.1063/1.4942172] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Calculating rovibrationally excited states of H2D+ and HD2+ by combination of fixed node and multi-state rotational diffusion Monte Carlo. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2015.12.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Szalay V. Aspects of the Eckart frame ro-vibrational kinetic energy operator. J Chem Phys 2015; 143:064104. [DOI: 10.1063/1.4928433] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Szalay V. Understanding nuclear motions in molecules: Derivation of Eckart frame ro-vibrational Hamiltonian operators via a gateway Hamiltonian operator. J Chem Phys 2015; 142:174107. [DOI: 10.1063/1.4919606] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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19
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Han H, Li A, Guo H. Toward spectroscopically accurate global ab initio potential energy surface for the acetylene-vinylidene isomerization. J Chem Phys 2014; 141:244312. [DOI: 10.1063/1.4904859] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Huixian Han
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
- School of Physics, Northwest University, Xi’an, Shaanxi 710069, China
| | - Anyang Li
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
| | - Hua Guo
- Department of Chemistry and Chemical Biology,
University of New Mexico, Albuquerque, New Mexico
87131, USA
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20
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Sibert EL, Tabor DP, Kidwell NM, Dean JC, Zwier TS. Fermi Resonance Effects in the Vibrational Spectroscopy of Methyl and Methoxy Groups. J Phys Chem A 2014; 118:11272-81. [DOI: 10.1021/jp510142g] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edwin L. Sibert
- Department
of Chemistry and Theoretical Chemistry Institute, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Daniel P. Tabor
- Department
of Chemistry and Theoretical Chemistry Institute, University of Wisconsin−Madison, Madison, Wisconsin 53706, United States
| | - Nathanael M. Kidwell
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Jacob C. Dean
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
| | - Timothy S. Zwier
- Department
of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084, United States
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21
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Wang X, Wang M, Yang C, Li J, Tong D. Theoretical study of spectroscopic constants and anharmonic force field of formaldehyde. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2014. [DOI: 10.1142/s0219633614500497] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The equilibrium geometries of formaldehyde are optimized with B3LYP, B3PW91 and MP2 methods employing three basis sets 6-311++G(2d,2p), aug-cc-pVTZ and cc-pVTZ, respectively, which agree well with the corresponding experimental and previous theoretical data. The best optimized geometries are obtained at the theoretical level B3LYP/6-311++G(2d,2p) basis set. Basing on the calculated equilibrium geometries, the spectroscopic constants and anharmonic force field of H 2 CO are investigated. The results show that DFT method is superior to MP2 method at the calculation of spectroscopic constants and force constants of H 2 CO . The vibration–rotation interaction constants and fundamental vibrational wave numbers of H 2 CO are firstly theoretically calculated. The Coriolis coupling constants, cubic force constants and most of quartic force constants are firstly theoretically predicted.
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Affiliation(s)
- Xuejun Wang
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, P. R. China
| | - Meishan Wang
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, P. R. China
| | - Chuanlu Yang
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, P. R. China
| | - Jing Li
- School of Physics and Optoelectronics Engineering, Ludong University, Yantai 264025, P. R. China
| | - Dianmin Tong
- Department of Physics, Shandong University, Jinan 250100, P. R. China
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22
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Pesonen J. Eckart frame vibration-rotation Hamiltonians: Contravariant metric tensor. J Chem Phys 2014; 140:074101. [DOI: 10.1063/1.4865750] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Fábri C, Mátyus E, Császár AG. Numerically constructed internal-coordinate Hamiltonian with Eckart embedding and its application for the inversion tunneling of ammonia. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 119:84-89. [PMID: 23702049 DOI: 10.1016/j.saa.2013.03.090] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 03/26/2013] [Accepted: 03/28/2013] [Indexed: 06/02/2023]
Abstract
It is shown that the use of an Eckart-frame embedding with a kinetic energy operator expressed in curvilinear internal coordinates becomes feasible and straightforward to implement for arbitrary molecular compositions and internal coordinates if the operator is defined numerically over a (discrete variable representation) grid. The algorithm proposed utilizes the transformation method of Dymarsky and Kudin to maintain the rotational Eckart condition. In order to demonstrate the applicability and flexibility of our approach the non-rigid ammonia molecule is considered and the corresponding rotational-vibrational energy levels and wave functions are computed using kinetic energy operators with three different embeddings. Two of them fulfill the Eckart conditions corresponding to a trigonal pyramidal (C3v) and a trigonal planar (D3h) reference structure and the third one is a non-Eckart frame. The computed energy levels are, of course, identical, and the structure of the three different wave-function representations are analyzed in terms of the rigid rotor functions for a symmetric top. The possible advantages of one frame representation over another are discussed concerning the interpretation of the rovibrational states in terms of the traditional rigid rotor labels.
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Affiliation(s)
- Csaba Fábri
- Laboratory of Molecular Structure and Dynamics, Institute of Chemistry, Eötvös University, P.O. Box 32, H-1518 Budapest 112, Hungary
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24
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Tyuterev V, Tashkun S, Rey M, Kochanov R, Nikitin A, Delahaye T. Accurate Spectroscopic Models for Methane Polyads Derived from a Potential Energy Surface Using High-Order Contact Transformations. J Phys Chem A 2013; 117:13779-805. [DOI: 10.1021/jp408116j] [Citation(s) in RCA: 107] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vladimir Tyuterev
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
| | - Sergei Tashkun
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Michael Rey
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
| | - Roman Kochanov
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Andrei Nikitin
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
- LTS, V.E. Zuev Institute of Atmospheric Optics, Academician Zuev square 1, 634021, Tomsk, Russia
| | - Thibault Delahaye
- GSMA,
UMR CNRS 7331, University of Reims, BP 1039, 51687 Reims Cedex 2, France
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25
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Krasnoshchekov SV, Stepanov NF. Polyad quantum numbers and multiple resonances in anharmonic vibrational studies of polyatomic molecules. J Chem Phys 2013; 139:184101. [DOI: 10.1063/1.4829143] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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26
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Petit AS, Ford JE, McCoy AB. Simultaneous Evaluation of Multiple Rotationally Excited States of H3+, H3O+, and CH5+ Using Diffusion Monte Carlo. J Phys Chem A 2013; 118:7206-20. [DOI: 10.1021/jp408821a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrew S. Petit
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Jason E. Ford
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
| | - Anne B. McCoy
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States
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27
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Wang XG, Carrington T. Computing rovibrational levels of methane with curvilinear internal vibrational coordinates and an Eckart frame. J Chem Phys 2013; 138:104106. [DOI: 10.1063/1.4793474] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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28
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Krasnoshchekov SV, Isayeva EV, Stepanov NF. Numerical-analytic implementation of the higher-order canonical Van Vleck perturbation theory for the interpretation of medium-sized molecule vibrational spectra. J Phys Chem A 2012; 116:3691-709. [PMID: 22369280 DOI: 10.1021/jp211400w] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Anharmonic vibrational states of semirigid polyatomic molecules are often studied using the second-order vibrational perturbation theory (VPT2). For efficient higher-order analysis, an approach based on the canonical Van Vleck perturbation theory (CVPT), the Watson Hamiltonian and operators of creation and annihilation of vibrational quanta is employed. This method allows analysis of the convergence of perturbation theory and solves a number of theoretical problems of VPT2, e.g., yields anharmonic constants y(ijk), z(ijkl), and allows the reliable evaluation of vibrational IR and Raman anharmonic intensities in the presence of resonances. Darling-Dennison and higher-order resonance coupling coefficients can be reliably evaluated as well. The method is illustrated on classic molecules: water and formaldehyde. A number of theoretical conclusions results, including the necessity of using sextic force field in the fourth order (CVPT4) and the nearly vanishing CVPT4 contributions for bending and wagging modes. The coefficients of perturbative Dunham-type Hamiltonians in high-orders of CVPT are found to conform to the rules of equality at different orders as earlier proven analytically for diatomic molecules. The method can serve as a good substitution of the more traditional VPT2.
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29
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Petit AS, McCoy AB. Diffusion Monte Carlo Approaches for Evaluating Rotationally Excited States of Symmetric Top Molecules: Application to H3O+ and D3O+. J Phys Chem A 2009; 113:12706-14. [DOI: 10.1021/jp905098k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Andrew S. Petit
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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30
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Hinkle CE, McCoy AB. Theoretical Investigations of Mode Mixing in Vibrationally Excited States of CH5+. J Phys Chem A 2009; 113:4587-97. [DOI: 10.1021/jp8112733] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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31
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Yagi K, Hirata S, Hirao K. Vibrational quasi-degenerate perturbation theory: applications to fermi resonance in CO2, H2CO, and C6H6. Phys Chem Chem Phys 2008; 10:1781-8. [DOI: 10.1039/b719093j] [Citation(s) in RCA: 101] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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32
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Ebrahimi H, Tafazzoli M. The vibration–rotation kinetic energy operator for sequentially bonded tetra-atomic molecules in internal coordinates. Mol Phys 2007. [DOI: 10.1080/00268970701551880] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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33
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Ramesh SG, Sibert EL. Relaxation of the CH stretch in liquid CHBr3: Solvent effects and decay rates using classical nonequilibrium simulations. J Chem Phys 2006; 125:244513. [PMID: 17199361 DOI: 10.1063/1.2403876] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
This article addresses two questions regarding the decay of the CH stretch in liquid CHBr3. The first is whether the initial steps of the relaxation primarily involve energy redistribution within the excited molecule alone. Gas phase quantum mechanical and classical calculations are performed to examine the role of the solvent in this process. At the fundamental excitation level, it is found that CH stretch decay is, in fact, strongly solvent driven. The second question is on the applicability of a fully classical approach to the calculation of CH stretch condensed phase decay rates. To this end, nonequilibrium molecular dynamics simulations are performed. The results are compared with quantum mechanical rates computed previously. The two methods are found to be in fair agreement with each other. However, care must be exercised in the interpretation of the classical results.
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Affiliation(s)
- Sai G Ramesh
- Department of Chemistry, and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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34
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Sprague MM, Ramesh SG, Sibert EL. Combination of perturbative and variational methods for calculating molecular spectra: Calculation of the υ=3–5 CH stretch overtone spectrum of CHF3. J Chem Phys 2006; 124:114307. [PMID: 16555888 DOI: 10.1063/1.2178297] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Highly excited states of the CHF3 molecule belonging to the third, fourth, and fifth Fermi polyad are calculated using a combination of the Van Vleck perturbation theory and a variational treatment. The perturbation theory preconditions the Hamiltonian matrix by transforming away all couplings except those between nearly degenerate states. This transformation is implemented so that eigenvalues can be found with significantly smaller matrices than that which would be needed in the original normal mode representation. Even with preconditioning, at the energies as high as 3-5 quanta in the CH stretch, it is not possible to directly diagonalize the Hamiltonian matrix due to the large basis sets required. Iterative methods, particularly the block-Davidson method, are explored for finding the eigenvalues. The methods are compared and the advantages discussed.
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Affiliation(s)
- Megan M Sprague
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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35
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Isaacson AD. Including Anharmonicity in the Calculation of Rate Constants. 1. The HCN/HNC Isomerization Reaction. J Phys Chem A 2005; 110:379-88. [PMID: 16405308 DOI: 10.1021/jp058113y] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A method for calculating anharmonic vibrational energy levels in asymmetric top and linear systems that is based on second-order perturbation theory in curvilinear coordinates is extended to the bound generalized normal modes at nonstationary points along a reaction path. Explicit formulas for the anharmonicity coefficients, x(ij), and the constant term, E0, are presented, and the necessary modifications for resonance cases are considered. The method is combined with variational transition state theory with semiclassical multidimensional tunneling approximations to calculate thermal rate constants for the HCN/HNC isomerization reaction. Although the results for this system are not very sensitive to the choice of coordinates, we find that the inclusion of anharmonicity leads to a substantial improvement in the vibrational energy levels. We also present detailed comparisons of rate constants computed with and without anharmonicity, with various approximations for incorporating tunneling along the reaction path, and with a more practical approach to calculating the vibrational partition functions needed for larger systems.
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Affiliation(s)
- Alan D Isaacson
- Department of Chemistry and Biochemistry, Miami University, Oxford, Ohio 45056, USA.
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36
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Ramesh SG, Sibert EL. Combined perturbative-variational investigation of the vibrations of CHBr3 and CDBr3. J Chem Phys 2004; 120:11011-25. [PMID: 15268131 DOI: 10.1063/1.1738643] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
A full dimensional vibrational treatment of CHBr(3) and CDBr(3) using Van Vleck perturbation theory followed by a variational calculation is presented. The calculation of a force field, and its adjustment for better match with experiment, is discussed. The computed eigenstates and spectral features are compared to experiment. Changes in intensities of the nu(1) and 2nu(4) bands upon simple alterations of the dipole moment expansion are described.
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Affiliation(s)
- Sai G Ramesh
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA
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37
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Lee HS, Light JC. Iterative solutions with energy selected bases for highly excited vibrations of tetra-atomic molecules. J Chem Phys 2004; 120:4626-37. [PMID: 15267322 DOI: 10.1063/1.1646370] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The use of energy selected bases (ESB) with iterative diagonalization of the Hamiltonian matrix is described for vibrations of tetra-atomic systems. The performance of the method is tested by computing vibrational states of HOOH below 10,000 cm(-1) (1296 A+ symmetry states) and H(2)CO below 13,500 cm(-1) (729 A(1) symmetry states). For iterative solutions, we tested both the implicitly restarted Lanczos method (IRLM) and the standard (nonreorthogonalizing) Lanczos approach. Comparison with other contracted basis approach as well as direct product grid representation shows superior performance of the ESB/IRLM approach. Of the two systems, H(2)CO is found to be more challenging than HOOH since it has much stronger couplings among vibrational modes, which leads to a drastically larger primitive basis set. For H(2)CO we also discuss some interesting behavior of the molecule in the high internal energy regime.
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Affiliation(s)
- Hee-Seung Lee
- Department of Chemistry and James Franck-Institute, University of Chicago, Chicago, Illinois 60637, USA
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38
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Castillo-Chará J, Sibert EL. Full dimensional theoretical study of the torsion-vibration eigenstates and torsional splittings of CH3OH. J Chem Phys 2003. [DOI: 10.1063/1.1624595] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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39
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Lee HS, Light JC. Molecular vibrations: Iterative solution with energy selected bases. J Chem Phys 2003. [DOI: 10.1063/1.1539037] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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40
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Wang XG, Sibert EL. A perturbative calculation of the rovibrational energy levels of methane. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2002; 58:863-872. [PMID: 11995634 DOI: 10.1016/s1386-1425(01)00674-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The rovibrational energy levels of methane are determined from a quartic ab initio potential energy force field where the expansion coordinates are the Morse coordinates for the stretches and extension coordinates for the bends. Energies are calculated using canonical Van Vleck perturbation theory. Results are obtained for both rotation-vibration Hamiltonians expressed as functions of curvilinear and rectilinear normal coordinates. Second, fourth, and sixth order curvilinear results are compared with experimental results, and fourth order results for the rectilinear and curvilinear Hamiltonian are compared to each other. The calculated rovibrational levels are in good agreement with the experimental values for low J levels. The calculated rotational level splittings are in even better agreement with the experiment. In particular, the ground state tetrahedral splittings, which are as small as 10(-4) cm(-1), are well reproduced by our calculations at sixth order.
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Affiliation(s)
- Xiao-Gang Wang
- Department of Chemistry and Theoretical Chemistry Institute, University of Wisconsin Madison, 53706, USA.
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41
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Zúñiga J, Bastida A, Requena A. Optimal generalized internal vibrational coordinates and potential energy surface for the ground electronic state of SO2. J Chem Phys 2001. [DOI: 10.1063/1.1377893] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
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42
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Sugny D, Joyeux M, Siber EL. Investigation of the vibrational dynamics of the HCN/CNH isomers through high order canonical perturbation theory. J Chem Phys 2000. [DOI: 10.1063/1.1311967] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Absorption and resonance emission spectra of SO2(X̃1A1/C̃1B2) calculated from ab initio potential energy and transition dipole moment surfaces. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)01049-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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44
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WANG XIAOGANG, SIBERT EDWINL, CHILD MARKS. Exact vibration-rotation kinetic energy operators in two sets of valence coordinates for centrally connected penta-atomic molecules. Mol Phys 2000. [DOI: 10.1080/00268970009483295] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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45
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Wang XG, Sibert EL, Martin JML. Anharmonic force field and vibrational frequencies of tetrafluoromethane (CF4) and tetrafluorosilane (SiF4). J Chem Phys 2000. [DOI: 10.1063/1.481590] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Sugny D, Joyeux M. On the application of canonical perturbation theory to floppy molecules. J Chem Phys 2000. [DOI: 10.1063/1.480559] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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47
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Wang XG, Sibert EL. A nine-dimensional perturbative treatment of the vibrations of methane and its isotopomers. J Chem Phys 1999. [DOI: 10.1063/1.480271] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Ma G, Guo H. Quantum calculations of highly excited vibrational spectrum of sulfur dioxide. II. Normal to local mode transition and quantum stochasticity. J Chem Phys 1999. [DOI: 10.1063/1.479705] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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49
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Ma G, Chen R, Guo H. Quantum calculations of highly excited vibrational spectrum of sulfur dioxide. I. Eigenenergies and assignments up to 15 000 cm−1. J Chem Phys 1999. [DOI: 10.1063/1.478749] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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50
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Wu XT, McCoy AB, Hayes EF. Rotation–vibration interactions in (HF)2. I. Using parallel supercomputers to calculate rotation–vibration energy levels. J Chem Phys 1999. [DOI: 10.1063/1.477971] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
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