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Metallic cluster beams from a 2.5 MV Van de Graaff accelerator for cluster—solid interaction studies: preliminary results with Aun+ clusters

  • M. Fallavier
  • Y. Champelovier
  • M. Ferrari
  • R. Kirsch
  • J. C. Poizat
  • J. Remillieux
  • J. P. Thomas
  • B. Canut
  • M. Monchanin
  • S. M. M. Ramos
  • P. Thévenard
  • S. Della Negra
  • J. P. Mouffron
  • P. Nicol
Conference paper

Abstract

A liquid metal ion source (LMIS) was installed on the high-voltage terminal of the 2.5 MV single-stage Van de Graaff accelerator of the Institut de Physique Nucléaire de Lyon and was used to deliver intense MeV energy beams of cluster ions. After acceleration, the ions produced from an eutectic Au—Si alloy were mass-selected by means of a magnetic analysis. The beam was mainly composed of the monoatomic ions Au+ and Si+ and of the clustersAu n + , Au n Si+, and Au n Si 2 + (n = 2 − 13). The intensities decreased for increasing n values, but remained remarkably high. For pure gold ions, the maximutn intensity measured at the target site varied from 250 nA, for Au+, down to 20 pA, for Au 9 + . The research program on the study of the specific effects of the impact of energetic clusters on solid surfaces concerns the fundamental interaction processes and the solid modifications induced by high-density energy deposits. Our first experiments with Au n + , clusters led to the following results: Nonlinear dependence on the cluster size of kinetic secondary electron emission from thin carbon foil enhances the damage rate of irradiated silicon crystals as compared to monoatomic Au+ ion effects.

PACS

79.20.Rf Atomic Molecular and ion beam impact and interactions with surfaces — 36.40.-c Atomic and molecular clusters — 61.80.Lj Atom and molecule irradiation effects 

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Copyright information

© Springer-Verlag Italia 1999

Authors and Affiliations

  • M. Fallavier
    • 1
  • Y. Champelovier
    • 1
  • M. Ferrari
    • 1
  • R. Kirsch
    • 1
  • J. C. Poizat
    • 1
  • J. Remillieux
    • 1
  • J. P. Thomas
    • 1
  • B. Canut
    • 2
  • M. Monchanin
    • 2
  • S. M. M. Ramos
    • 2
  • P. Thévenard
    • 2
  • S. Della Negra
    • 3
  • J. P. Mouffron
    • 3
  • P. Nicol
    • 3
  1. 1.Institut de Physique Nucléaire de Lyon, IN2P3-CNRSUniversité Claude Bernard Lyon-1Villeurbanne CedexFrance
  2. 2.Département de Physique des Matériaux, UMR CNRS 5586Université Claude Bernard Lyon-1Villeurbanne CedexFrance
  3. 3.Institut de Physique Nucléaire d’Orsay, IN2P3-CNRSOrsay CedexFrance

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