Issue 26, 2019

Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2

Abstract

The choice of ab initio electronic structure method is an important factor in determining the fidelity of nonadiabatic dynamics simulations. We present an in-depth comparison of two simulations of photodissociation in the CS2 molecule following excitation to the 11B2 state. The simulations account for nonadiabatic and spin–orbit coupling, and are performed using the SHARC surface-hopping approach combined with state-averaged SA8-CASSCF(8,6)/SVP and SA8-CASSCF(10,8)/SVP ab initio calculations, with additional reference calculations at the MRCI(14,10)/aug-cc-pvTZ level. The relative performance and veracity of the simulations can be assessed by inspection of the potential energy curves along specific coordinates. The simulations demonstrate direct competition between internal conversion and intersystem crossing, with strong correlation between molecular geometry, electronic state density, and dynamics.

Graphical abstract: Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2

Supplementary files

Article information

Article type
Paper
Submitted
08 sep 2018
Accepted
29 nov 2018
First published
29 nov 2018
This article is Open Access
Creative Commons BY-NC license

Phys. Chem. Chem. Phys., 2019,21, 14226-14237

Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2

D. Bellshaw, R. S. Minns and A. Kirrander, Phys. Chem. Chem. Phys., 2019, 21, 14226 DOI: 10.1039/C8CP05693E

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