title: Dissociation processes of Kr2(+) and Kr3(+) studied by threshold photoelectron-photoion coincidence measurements.
abstract: A time-of-flight (TOF) ion mass spectrum in coincidence with threshold photoelectrons was measured in the photon energy region between the first and second dissociation limits of Kr2(+) to examine the decay processes of the Kr2(+) II(1/2u) state. The measured TOF spectrum reveals that Kr+ fragment ions are produced through dissociation of the repulsive I(1/2g) state, which can be formed by the decay process of the II(1/2u) state accompanied with emission of photons. The potential-energy curve of the I(1/2g) state is deduced with detailed analysis of the observed TOF spectrum, in which the radiative lifetime of the II(1/2u) state was also derived to be 2.5 micros. Additionally, evidence of the dissociation process of Kr3(+) ions was obtained in the same photon energy region, where the dominant channel is Kr3(+) --> Kr2(+) + Kr.
authors.affiliation: Physics Division, Faculty of Medical Science, University of Fukui, Matsuoka, Fukui 910-1193, Japan. yoshii@fmsrsa.fukui-med.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Yoshii
authors.forename: K
authors.initials: K
authors.lastname: Tsukamoto
authors.forename: T
authors.initials: T
authors.lastname: Hayaishi
authors.forename: T
authors.initials: T
authors.lastname: Aoto
authors.forename: K
authors.initials: K
authors.lastname: Ito
authors.forename: Y
authors.initials: Y
authors.lastname: Morioka