Fano resonances in the photoinduced H-atom elimination dynamics in the πσ* states of pyrrole.

Fano resonances in the photoinduced H-atom elimination dynamics in the πσ* states of pyrrole.
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吡咯 π* 态光致氢原子消除动力学中的 Fano 共振

DOI:
10.1039/c7cp01401e
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发表时间:
2017
期刊:
Physical chemistry chemical physics : PCCP
影响因子:
--
通讯作者:
D. Picconi
D. Picconi
中科院分区:
--
文献类型:
--
作者:
S. Yu. Grebenshchikov;D. Picconi

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Fano共振被预测为吡咯的πσ*光化学的显著特征。Fano干涉导致了扭曲的吸收带和内部热的光碎片。用高能级从头算理论和量子力学研究的干涉,受到两个不同的动力学场景的支持,这些场景由πσ*态和基电子态之间的两个出射通道圆锥形交点控制。对于最低的1A2(πσ*)态,锥形交叉处的耦合较弱,干扰解离路径是非绝热的;对于较高的1b1(πσ*)态,圆锥交叉处的耦合较强,干扰解离路径是绝热的。随着动力学建模中包含的自由度数量的增加,这两种情况都会持续存在。它们有望在一大类模型UV生物发色团的πσ*光化学中发挥作用。
Fano resonances are predicted to be prominent features of the πσ* photochemistry of pyrrole. The Fano interference leads to distorted absorption bands and internally hot photofragments. The interference, studied using high level ab initio theory and quantum mechanics, is supported by two distinct dynamical scenarios controlled by two exit channel conical intersections between the πσ* states and the ground electronic state . For the lowest state 1A2(πσ*), the coupling at the conical intersection is weak, and the interfering dissociation pathways are diabatic; for the higher lying 1B1(πσ*) state, the coupling at the conical intersection is strong, and the interfering dissociation pathways are adiabatic. Both scenarios persist with increasing number of degrees of freedom included in the dynamic modelling. They are expected to be operative in the πσ* photochemistry of a broad class of model UV biochromophores.
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