title: Visualizing recurrently migrating hydrogen in acetylene dication by intense ultrashort laser pulses.
abstract: We demonstrate the visualization of ultrafast hydrogen migration in deuterated acetylene dication (C2D2{2+}) by employing the pump-probe Coulomb explosion imaging with sub-10-fs intense laser pulses (9 fs, 0.13 PW/cm{2}, 800 nm). It is shown, from the temporal evolution of the momenta of the fragment ions produced by the three-body explosion, C2D2{3+}-->D{+} + C{+} + CD{+}, that the migration proceeds in a recurrent manner: the deuterium atom first shifts from one carbon site to the other in a short time scale (approximately 90 fs) and then migrates back to the original carbon site by 280 fs, in competition with the molecular dissociation.
authors.affiliation: Institute for Molecular Science, National Institutes of Natural Sciences, Myodaiji, Okazaki, Aichi 444-8585, Japan. hishi@ims.ac.jp
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Hishikawa
authors.forename: Akitaka
authors.initials: A
authors.lastname: Matsuda
authors.forename: Mizuho
authors.initials: M
authors.lastname: Fushitani
authors.forename: Eiji J
authors.initials: EJ
authors.lastname: Takahashi
mesh_terms: D000114:Acetylene / Q000737:chemistry*; D003903:Deuterium; D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D007834:Lasers; D013057:Spectrum Analysis / Q000379:methods
chemical_list: D006859:Hydrogen; D003903:Deuterium; D000114:Acetylene