Nonadiabatic Reactive Quenching of OH(A2Σ+) by H2: Origin of High Vibrational Excitation in the H2O Product
Articolo
Data di Pubblicazione:
2022
Citazione:
Nonadiabatic Reactive Quenching of OH(A2Σ+) by H2: Origin of High Vibrational Excitation in the H2O Product / S. Han, B. Zhao, R. Conte, C.L. Malbon, J.M. Bowman, D.R. Yarkony, H. Guo. - In: JOURNAL OF PHYSICAL CHEMISTRY. A, MOLECULES, SPECTROSCOPY, KINETICS, ENVIRONMENT, & GENERAL THEORY. - ISSN 1089-5639. - 126:39(2022 Oct 06), pp. 6944-6952. [10.1021/acs.jpca.2c05704]
Abstract:
The nonadiabatic dynamics of the reactive quenching channel of the OH(A2 sigma+) + H2/D2 collisions is investigated with a semiclassical surface hopping method, using a recently developed four-state diabatic potential energy matrix (DPEM). In agreement with experimental observations, the H2O/HOD products are found to have significant vibrational excitation. Using a Gaussian binning method, the H2O vibrational state distribution is determined. The preferential energy disposal into the product vibrational modes is rationalized by an extended Sudden Vector Projection model, in which the h and g vectors associated with the conical intersection are found to have large projections with the product normal modes. However, our calculations did not find significant insertion trajectories, suggesting the need for further improvement of the DPEM.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
S. Han, B. Zhao, R. Conte, C.L. Malbon, J.M. Bowman, D.R. Yarkony, H. Guo
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