MULTIPLE IONIZATION OF SODIUM CLUSTERS BY ION IMPACT

F. Chandezon, C. Guet, B.A. Huber, D. Jalabert, M. Maurel, E. Monnand, C. Ristori and J.C. Rocco
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F. Chandezon: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
C. Guet: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
B.A. Huber: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
D. Jalabert: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
M. Maurel: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
E. Monnand: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
C. Ristori: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France
J.C. Rocco: CEA/Département de Recherche Fondamentale sur la Matière Condensée, Laboratoire des Ions, Atomes et Agrégats, CENG, 17, rue des Martyrs, F38054 Grenoble Cedex 9, France

Surface Review and Letters (SRL), 1996, vol. 03, issue 01, 529-533

Abstract: The electronic excitation of alkali-metal clusters by low-energy ions is investigated experimentally for the first time. Multi-ionized clusters possibly undergoing Coulomb dissociation are formed and detected. Free sodium clusters of a few hundred atoms have been bombarded by different ion beams(H+,O5+,Ar8+)of velocity ranging from 0.2 to0.9v0. The mass/charge ratio of charged outgoing clusters is measured by a time-of-flight spectrometer of high resolution$(\frac{m}{\Delta m} =2500)$. Critical sizes for stability against charge excess have been deduced for cluster charges up to 6. Temperature effects on critical sizes are observed, and they reveal two distinct regimes: electron transfer in peripheral collisions with multicharged ions leading to “cold” highly ionized clusters and strong electronic excitation in central collisions subsequently followed by multielectron emission.

Date: 1996
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DOI: 10.1142/S0218625X96000966

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