title: Two-body Coulomb explosion in methylacetylene in intense laser fields: double proton migration and proton/deuteron exchange.
abstract: Two-body decomposition processes of methylacetylene (CH(3)CCH) and its isotopomer methyl-d(3)-acetylene (CD(3)CCH) in intense laser fields (790 nm, 40 fs, 5.0 × 10(13) W cm(-2)) are investigated by the coincidence momentum imaging (CMI). In methyl-d(3)-acetylene, a total of six decomposition pathways in which one of the C-C bonds is broken and a total of six pathways in which an atomic hydrogen ion (H(+) or D(+)) or a molecular hydrogen ion (H(2)(+), HD(+), D(3)(+), or HD(2)(+)) is ejected are identified. It is revealed from the analysis of the CMI data that the migration of two deuterons as well as the exchange between a proton and a deuteron occurs prior to the two-body decomposition of a doubly charged parent molecule.
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Okino
authors.forename: Anri
authors.initials: A
authors.lastname: Watanabe
authors.forename: Huailiang
authors.initials: H
authors.lastname: Xu
authors.forename: Kaoru
authors.initials: K
authors.lastname: Yamanouchi
mesh_terms: D000480:Alkynes / Q000737:chemistry*; D003903:Deuterium / Q000737:chemistry*; D041961:Deuterium Exchange Measurement; D007834:Lasers; D011522:Protons
chemical_list: D000480:Alkynes; D011522:Protons; C022030:methylacetylene; D003903:Deuterium