title: Observation of direct dissociative ionization in molecular hydrogen.
abstract: Direct dissociative ionization is the simplest three-body breakup process in H2. We describe the experimental verification of direct dissociative ionization to the repulsive A2Sigma(+)(u) state by resolving the kinetic energy and angular distributions of the formed protons. A (2+1) resonant enhanced multiphoton ionization process via the isotropic E,F (1)Sigma(+)(g)(v = 6,J = 0) level is employed. The structure in the kinetic energy spectrum is well described by a projection of the vibrational wave function of the E,F (1)Sigma(+)(g)(v = 6,J = 0) state onto the repulsive ionic state. The electronic character of the ionization continuum is revealed by the proton angular distribution.
authors.affiliation: Department of Molecular and Laser Physics, University of Nijmegen, Toernooiveld, 6525 ED Nijmegen, The Netherlands.
authors.forename: B L
authors.initials: BL
authors.lastname: Bakker
authors.forename: D H
authors.initials: DH
authors.lastname: Parker
authors.forename: W J
authors.initials: WJ
authors.lastname: van der Zande