title: Detection of the Excited-State NH2(Ã2A1) in the Ultraviolet Photodissociation of Methylamine.
abstract: 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 the v = 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.
authors.affiliation: Department of Chemistry, Graduate School of Science, Hiroshima University , Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Yuuki
authors.initials: Y
authors.lastname: Onitsuka
authors.affiliation: Department of Chemistry, Graduate School of Science, Hiroshima University , Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Katsuyoshi
authors.initials: K
authors.lastname: Yamasaki
authors.affiliation: Department of Chemistry, Graduate School of Science, Hiroshima University , Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Goto
authors.affiliation: Department of Chemistry, Graduate School of Science, Hiroshima University , Kagamiyama 1-3-1, Higashi-Hiroshima, Hiroshima 739-8526, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kohguchi