Simplified approach to the mixed time-averaging semiclassical initial value representation for the calculation of dense vibrational spectra
Articolo
Data di Pubblicazione:
2018
Citazione:
Simplified approach to the mixed time-averaging semiclassical initial value representation for the calculation of dense vibrational spectra / M. Buchholz, F. Grossmann, M. Ceotto. - In: THE JOURNAL OF CHEMICAL PHYSICS. - ISSN 0021-9606. - 148:11(2018 Mar 21). [10.1063/1.5020144]
Abstract:
We present and test an approximate method for the semiclassical calculation of vibrational spectra. The approach is based on the mixed time-averaging semiclassical initial value representation method, which is simplified to a form that contains a filter to remove contributions from approximately harmonic environmental degrees of freedom. This filter comes at no additional numerical cost, and it has no negative effect on the accuracy of peaks from the anharmonic system of interest. The method is successfully tested for a model Hamiltonian and then applied to the study of the frequency shift of iodine in a krypton matrix. Using a hierarchic model with up to 108 normal modes included in the calcula-
tion, we show how the dynamical interaction between iodine and krypton yields results for the lowest excited iodine peaks that reproduce experimental findings to a high degree of accuracy.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
semiclassical, molecular spectroscopy, spectra, infrared, iodine, Krypton
Elenco autori:
M. Buchholz, F. Grossmann, M. Ceotto
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