title: Concerted and sequential Coulomb explosion processes of N2O in intense laser fields by coincidence momentum imaging.
abstract: The Coulomb explosion dynamics of N2O in intense laser fields (800 nm, 60 fs, approximately 0.16 PWcm2) is studied by the coincidence momentum imaging method. From the momentum correlation maps obtained for the three-body fragmentation pathway, N2O3+-->N++N++O+, the ultrafast structural deformation dynamics of N2O prior to the Coulomb explosion is extracted. It is revealed that the internuclear N-N and N-O distances stretch simultaneously as the bond angle less than approximately N-N-O decreases. In addition, two curved thin distributions are identified in the momentum correlation maps, and are interpreted well as those originating from the sequential dissociation pathway, N2O3+-->N++NO2+-->N++N++O+.
authors.affiliation: Department of Chemistry, School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Masakuni
authors.initials: M
authors.lastname: Ueyama
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Hasegawa
authors.forename: Akiyoshi
authors.initials: A
authors.lastname: Hishikawa
authors.forename: Kaoru
authors.initials: K
authors.lastname: Yamanouchi