The role of πσ* excited states in the photodissociation of heteroaromatic molecules
The role of πσ* excited states in the photodissociation of heteroaromatic molecules
复制标题
DOI：
10.1126/science.1125436
复制
发表时间：
2006-06-16
期刊：
影响因子：
56.9
通讯作者：
Nix, MGD
中科院分区：
文献类型：
--
作者：
Ashfold, MNR;Cronin, B;Nix, MGD
对咪唑、吡咯和苯酚在气相中紫外光解过程中形成的氢原子碎片动能的高分辨率测量证实，N(O)-H 键裂变是它们各自 (1)pi sigma* 激发态的重要非辐射衰变过程。测量结果还表明，各自的共片段（咪唑基、吡咯基和苯氧基）是在其可用振动状态的非常有限的子集中形成的。这些产物状态的识别可以对从母体分子到最终碎片的光诱导演化所涉及的电子振动耦合产生独特而详细的见解。
High-resolution measurements of the kinetic energies of hydrogen atom fragments formed during ultraviolet photolysis of imidazole, pyrrole, and phenol in the gas phase confirm that N(O)-H bond fission is an important nonradiative decay process from their respective (1)pi sigma* excited states. The measurements also reveal that the respective cofragments ( imidazolyl, pyrrolyl, and phenoxyl) are formed in very limited subsets of their available vibrational states. Identification of these product states yields uniquely detailed insights into the vibronic couplings involved in the photoinduced evolution from parent molecule to ultimate fragments.