期刊
JOURNAL OF CHEMICAL PHYSICS
卷 135, 期 15, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3651536
关键词
ab initio calculations; excited states; ground states; organic compounds; photodissociation; potential energy surfaces; vibrational states; vibronic states
资金
- Deutsche Forschungsgemeinschaft
- Ministry of Science, Education and Sport of Croatia [098-0982933-2920]
- Alexander von Humboldt Stiftung
- COST D37 action [WG0001-06]
- WTZ treaty between Austria and Croatia [HR17/2008]
- Robert A. Welch Foundation [D-0005]
- Vienna University Computer Centre [70019, 70151]
There has been a substantial amount of theoretical investigations on the photodynamics of pyrrole, often relying on surface hopping techniques or, if fully quantal, confining the study to the lowest two or three singlet states. In this study we extend ab initio based quantum dynamical investigations to cover simultaneously the lowest five singlet states, two pi - sigma* and two pi - pi* excited states. The underlying potential energy surfaces are obtained from large-scale MRCI ab initio computations. These are used to extract linear and quadratic vibronic coupling constants employing the corresponding coupling models. For the N-H stretching mode Q(24) an anharmonic treatment is necessary and also adopted. The results reveal a sub-picosecond internal conversion from the S-4 (pi - pi*) state, corresponding to the strongly dipole-allowed transition, to the S-1 and S-2 (pi - sigma*) states and, hence, to the ground state of pyrrole. The significance of the various vibrational modes and coupling terms is assessed. Results are also presented for the dissociation probabilities on the three lowest electronic states. (C) 2011 American Institute of Physics. [doi:10.1063/1.3651536]
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据