title: UV photodissociation of methyl bromide and methyl bromide cation studied by velocity map imaging.
abstract: We employ the velocity map imaging technique to measure kinetic energy and angular distributions of state selected CH(3) (v(2)=0,1,2,3) and Br ((2)P(3/2), (2)P(1/2)) photofragments produced by methyl bromide photolysis at 215.9 nm. These results show unambiguously that the Br and Br( *) forming channels result in different vibrational excitations of the umbrella mode of the methyl fragment. Low energy structured features appear on the images, which arise from CH(3)Br(+) photodissociation near 330 nm. The excess energy of the probe laser photon is channeled into CH(3) (+) vibrational excitation, most probably in the nu(4) degenerate bend.
authors.affiliation: Laboratoire Collisions Agregats Reactivite, IRSAMC, Universite de Toulouse, UPS, F-31062 Toulouse, France. val@irsamc.ups-tlse.fr
authors.forename: Valérie
authors.initials: V
authors.lastname: Blanchet
authors.forename: Peter C
authors.initials: PC
authors.lastname: Samartzis
authors.forename: Alec M
authors.initials: AM
authors.lastname: Wodtke