Detection of the Excited-State NH2 (A 2A1) in the Ultraviolet Photodissociation of Methylamine
Detection of the Excited-State NH2 (A 2A1) in the Ultraviolet Photodissociation of Methylamine
复制标题
甲胺紫外光解离中激发态 NH2 (A 2A1) 的检测
DOI：
10.1021/acs.jpca.6b08674
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Hiroshi Kohguchi
中科院分区：
文献类型：
--
作者：
Yuuki Onitsuka;Katsuyoshi Yamasaki;Hiroki Goto;Hiroshi Kohguchi
Ion-imaging and dispersed fluorescence spectroscopy are employed for the photodissociation dynamics study of methylamine in the photolysis wavelength range 205–213 nm. The methyl radical product is found to populate a wide range of ro-vibrational states, among which the CH3fragment generated in thev= 0 state shows a bimodal kinetic energy distribution. The internal energy analysis of the NH2counterproduct indicates that a lower kinetic energy component, which was observed only with the CH3(v=0) fragment, energetically matches the electronically excited Ã2A1state. The dispersed fluorescence spectrum, whose band structure is assigned to the Ã2A1→ X̃2B1transition, provides evidence of the CH3(v=0) + NH2(Ã2A1) pathway. The branching mechanism of the product pathway is discussed in terms of nuclear dynamics in the long-range region, where the conical intersection between the excited- and ground-state potential energy surfaces can play a significant role.
