Photodissociation dynamics in the first absorption band of pyrrole. II. Photofragment distributions for the 1A2(πσ*)←X̃1A1(ππ) transition.

Photodissociation dynamics in the first absorption band of pyrrole. II. Photofragment distributions for the 1A2(πσ*)←X̃1A1(ππ) transition.
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吡咯 II 第一吸收带的光解离动力学 1A2(ÏÏ*)âXÌ1A1(ÏÏ) 跃迁的光碎片分布

DOI:
10.1063/1.5019738
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发表时间:
2018
期刊:
The Journal of chemical physics
影响因子:
--
通讯作者:
S. Yu. Grebenshchikov
S. Yu. Grebenshchikov
中科院分区:
--
文献类型:
--
作者:
D. Picconi;S. Yu. Grebenshchikov

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分析了低位态吡咯光解离形成的吡咯基+H原子光碎片的总动能释放(TKER)。 TKER 分布包含关于碎裂过程的补充且通常比宽扩散吸收光谱更精确的信息。对于在出口通道锥形交叉点处隔离或耦合到基电子态的非绝热态,以量子力学的方式计算分布。计算使用论文 I 中构建的新颖的从头算准绝热势能矩阵。引入了基于近似重叠积分的绝热映射方法,通过该方法可以有效、准确地再现量子力学 TKER 分布。最后,将计算的 TKER 与实验结果进行比较。再现了测量的振动解析分布的主要特征,并详细分配和解释了光谱峰值。
The analysis of the total kinetic energy release (TKER) of the photofragments pyrrolyl + H-atom formed in the photodissociation of pyrrole in the low-lying stateis presented. The TKER distributions contain complementary and often more precise information on the fragmentation process than the broad diffuse absorption spectra. The distributions are calculated quantum mechanically for the diabatic stateeither isolated or coupled to the ground electronic state at an exit channel conical intersection. The calculations use the novel ab initio quasi-diabatic potential energy matrix constructed in paper I. The approximate overlap integral-based adiabatic mapping approach is introduced with which the quantum mechanical TKER distributions can be efficiently and accurately reproduced. Finally, the calculated TKERs are compared with the experimental results. The main features of the measured vibrationally resolved distributions are reproduced, and the spectral peaks are assigned and interpreted in detail.
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发表时间: 2015-01-01
影响因子: 3.3
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