Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2.
Correspondence between electronic structure calculations and simulations: nonadiabatic dynamics in CS2.
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电子结构计算与模拟之间的对应关系:CS2 中的非绝热动力学。
DOI:
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发表时间:
2019
期刊:
影响因子:
--
通讯作者:
A. Kirrander
中科院分区:
文献类型:
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作者:
D. Bellshaw;R. Minns;A. Kirrander
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.
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