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• W2043980350 abstract "Experimentally observed coupling between OH and CH stretching modes in the high overtone region has been modeled successfully in terms of a curvilinear internal coordinate Hamiltonian including harmonic coupling between anharmonic OH and CH stretching oscillators and cubic Fermi resonance kinetic and potential energy couplings between CH stretches and HCH bends. The Hamiltonian matrices have been set up in block diagonal forms including only resonant states. The potential-energy parameters have been optimized by the least-squares method using experimental vibrational term values as data. The OH/CH stretch interaction parameter obtained agrees well with the one calculated by perturbation theory from a published ab initio harmonic force field. The model has reproduced well experimental band origins in the OH stretching overtone region, and it has provided assignments for the bending overtones in the CH stretching fundamental region. Finally, a unitary transformation is found from the internal coordinate representation to the corresponding normal coordinate representation providing a set of normal coordinate parameters like diagonal anharmonicity parameters, Darling–Dennison resonance constants and cubic Fermi resonance force constants. The results confirm the experimental finding of energy redistribution between the OH and CH stretching modes on subnanosecond time scale at 5νOH." @default.
• W2043980350 created "2016-06-24" @default.
• W2043980350 creator A5041562700 @default.
• W2043980350 date "1997-05-15" @default.
• W2043980350 modified "2023-09-23" @default.
• W2043980350 title "Theoretical study of vibrational overtone spectroscopy and dynamics of methanol" @default.
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• W2043980350 doi "https://doi.org/10.1063/1.473806" @default.
• W2043980350 hasPublicationYear "1997" @default.
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