Detection of the excited-State NH22A1) in the ultraviolet photodissociation of methylamine

Yuuki Onitsuka, Katsuyoshi Yamasaki, Hiroki Goto, Hiroshi Kohguchi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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 CH3 fragment generated in the v = 0 state shows a bimodal kinetic energy distribution. The internal energy analysis of the NH2 counterproduct indicates that a lower kinetic energy component, which was observed only with the CH3(v=0) fragment, energetically matches the electronically excited Ã2A1 state. The dispersed fluorescence spectrum, whose band structure is assigned to the Ã2A1 → X2B1 transition, provides evidence of the CH3(v=0) + NH22A1) 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.

Original languageEnglish
Pages (from-to)8584-8589
Number of pages6
JournalJournal of Physical Chemistry A
Issue number43
Publication statusPublished - 2016 Nov 3


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