title: Translational and internal states of hydrogen molecules produced from the ultraviolet photodissociation of amorphous solid methanol.
abstract: Translationally and internally hot H(2) molecules are produced from the 157 nm photodissociation of amorphous solid methanol at 90 K by two distinct mechanisms: exothermic recombination of two H-atom photoproducts bound to the surface and unimolecular molecular elimination of H(2) from the photoexcited methanol. The vibrationally hot H(2)(v=2-5) products are characterized by high translational and rotational temperatures. A third mechanism, the almost thermoneutral abstraction of a hydrogen atom from methanol parent molecule by the photolytically produced hydrogen atom, yields translationally and rotationally cold H(2)(v=0 and 1) products. Comparison with the results of the vacuum ultraviolet photolysis of water ice is discussed. Production of translationally hot and cold hydrogen atoms is also confirmed.
authors.affiliation: Department of Molecular Engineering, Kyoto University, Kyoto 615-8510, Japan.
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Hama
authors.forename: Masaaki
authors.initials: M
authors.lastname: Yokoyama
authors.forename: Akihiro
authors.initials: A
authors.lastname: Yabushita
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kawasaki