title: Photon energy dependence of fragmentation of small argon clusters.
abstract: Photofragmentation of small argon clusters with size below ten atoms is reported. In this size range significant modifications from the electronic properties and geometry take place. When tuning the photon energy through the argon 2p edge, the fragmentation pattern is changed. Specifically, cation dimer production is enhanced at the 2p(32)-->4s resonance, while above the 2p edge almost complete atomization is observed. In both cases, the widths of the peaks in the mass spectra indicate that a large amount of kinetic energy is imparted to the fragment due to the formation of multiply charged clusters. A model based on "Coulomb explosion"-charge separation, simply resulting in a complete atomization of the cluster with no dependence on the photon energy-is insufficient to explain the observed photofragmentation of small clusters.
authors.affiliation: MAX-Lab, Lund University, P.O. Box 118, S-22100 Lund, Sweden. mathieu.gisselbrecht@lixam.u-psud.fr
authors.forename: Mathieu
authors.initials: M
authors.lastname: Gisselbrecht
authors.forename: Andreas
authors.initials: A
authors.lastname: Lindgren
authors.forename: Maxim
authors.initials: M
authors.lastname: Tchaplyguine
authors.forename: Florian
authors.initials: F
authors.lastname: Burmeister
authors.forename: Gunnar
authors.initials: G
authors.lastname: Ohrwall
authors.forename: Marcus
authors.initials: M
authors.lastname: Lundwall
authors.forename: Magnus
authors.initials: M
authors.lastname: Lundin
authors.forename: Ricardo R T
authors.initials: RR
authors.lastname: Marinho
authors.forename: Arnaldo
authors.initials: A
authors.lastname: Naves de Brito
authors.forename: Svante
authors.initials: S
authors.lastname: Svensson
authors.forename: Olle
authors.initials: O
authors.lastname: Björneholm
authors.forename: Stacey L
authors.initials: SL
authors.lastname: Sorensen