Quantum mechanical and semiclassical dynamics at a conical intersection

被引:90
作者
Ferretti, A [1 ]
Granucci, G [1 ]
Lami, A [1 ]
Persico, M [1 ]
Villani, G [1 ]
机构
[1] UNIV PISA, DIPARTIMENTO CHIM & CHIM IND, I-56126 PISA, ITALY
关键词
D O I
10.1063/1.471791
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We present simulations of wave-packet dynamics for a model of a conical intersection in two dimensions; The potential energy surfaces and couplings are functions of a total symmetrical coordinate and of a symmetry breaking one. The wave packet crosses the coupling region once, moving essentially in the direction of the symmetrical coordinate. The dynamics are determined by two methods, one quantum mechanical and the other semiclassical, based on trajectories and surface hopping. The semiclassical approximation is quite adequate for low coupling strengths in the diabatic representation, less so for larger couplings. Approximate analytic solutions for the two-dimensional problem and for one-dimensional analogs are provided, in order to generalize the numerical results and to analyze the reasons of the discrepancies between semiclassical and quantum-mechanical results. (C) 1996 American Institute of Physics.
引用
收藏
页码:5517 / 5527
页数:11
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