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

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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

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Publication details

The article was received on 08 Sep 2018, accepted on 29 Nov 2018 and first published on 29 Nov 2018


Article type: Paper
DOI: 10.1039/C8CP05693E
Citation: Phys. Chem. Chem. Phys., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
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    Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2

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

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