Article (Scientific journals)
Nonadiabatic dynamics in a forest of coupled states: Electronic state branching in the VUV photodissociation of N2
Gelfand, Natalia; Komarova, Ksenia; Remacle, Françoise et al.
2023In Journal of Chemical Physics, 158 (16), p. 164302
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Abstract :
[en] Multi-state electronic dynamics at higher excitation energies is needed for the understanding of a variety of energy rich situations, including chemistry under extreme conditions, vacuum ultraviolet (VUV) induced astrochemistry, and attochemistry. It calls for an understanding of three stages, energy acquisition, dynamical propagation, and disposal. It is typically not possible to identify a basis of uncoupled quantum states that is sufficient for the three stages. The handicap is the large number of coupled quantum states that is needed to describe the system. Progress in quantum chemistry provides the necessary background to the energetics and the coupling. Progress in quantum dynamics takes this as input for the propagation in time. Right now, it seems that we have come of age with potential detailed applications. We here report a demonstration to a coupled electron-nuclear quantum dynamics through a maze of 47 electronic states and with attention to the order in perturbation theory that is indicated using propensity rules for couplings. Close agreement with experimental results for the VUV photodissociation of 14N2 and its isotopomer 14N15N is achieved. We pay special attention to the coupling between two dissociative continua and an optically accessible bound domain. The computations reproduce and interpret the non-monotonic branching between the two exit channels producing N(2D) and N(2P) atoms as a function of excitation energy and its variation with the mass.
Disciplines :
Chemistry
Author, co-author :
Gelfand, Natalia
Komarova, Ksenia
Remacle, Françoise  ;  Université de Liège - ULiège > Département de chimie (sciences) > Laboratoire de chimie physique théorique
Levine, Raphael D.
Language :
English
Title :
Nonadiabatic dynamics in a forest of coupled states: Electronic state branching in the VUV photodissociation of N2
Publication date :
2023
Journal title :
Journal of Chemical Physics
ISSN :
0021-9606
eISSN :
1089-7690
Publisher :
American Institute of Physics, New York, Us ny
Volume :
158
Issue :
16
Pages :
164302
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fund for Scientific Research [BE]
Funding number :
T0205.2.
Available on ORBi :
since 24 June 2023

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