Absolute cross sections for the dissociation of hydrogen cluster ions in high-energy collisions with helium atoms

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S. Eden, J. Tabet, K. Samraoui, S. Louc, B. Farizon, M. Farizon, and S. Ouaskit
Institut de Physique Nucléaire de Lyon, IN2P3-CNRS et Université Claude Bernard Lyon 1, 43, boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France

T. D. Märk
Institut für Ionenphysik, Leopold Franzens Universität, Technikerstrasse 25, A-6020 Innsbruck, Austria

Received 11 October 2005; published 17 February 2006

Absolutedissociation cross sections are reported for H_n⁺ clusters of variedmass (n=3,5,,35) following collisions with He atoms at 60 keV/amu. Initialresults have been published previously for a smaller range ofcluster sizes [Ouaskit et al., Phys. Rev. A 49, 1484 (1994)].The present extended study includes further experimental results, reducing thestatistical errors associated with the absolute cross sections. The previouslysuggested quasilinear dependence of the H_n⁺ dissociation cross sections uponn is developed with reference to expected series of geometricalshells of H₂ molecules surrounding a H₃⁺ core. Recent calculationsidentify n=9 as corresponding to the first closed H₂ shell[e.g., tich et al., J. Chem. Phys. 107, 9482 (1997)]. Recurrenceof the distinct characteristics observed in the dissociation-cross-section dependence uponcluster size around n=9 provides the basis for the presentlyproposed subsequent closed shells at n=15, 21, 27, and 33,in agreement with the calculations of Nagashima et al. [J. Phys.Chem. 96, 4294 (1992)].

URL:	http://link.aps.org/doi/10.1103/PhysRevA.73.023201
DOI:	10.1103/PhysRevA.73.023201
PACS:	36.40.Qv 36.40.Qv Stability and fragmentation of atomic and molecular clusters YEAR: 2006
KEYWORDS:	hydrogen ions, positive ions, atomic clusters, helium neutral atoms, dissociation, atom-ion collisions

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