A semi-empirical concept for the calculation of electron-impact ionization cross-sections of neutral and ionized fullerenes

H. Deutsch, Paul Scheier, K. Becker, T. D. Märk

Research output: Contribution to journalArticle

Abstract

We have developed a semi-empirical approach to the calculation of cross-section functions (absolute value and energy dependence) for the electron-impact ionization of several neutral and ionized fullerenes C60q+ (q=0-3), for which reliable experimental data have been reported. In particular, we propose a modification of the simplistic assumption that the ionization cross-section of a cluster/fullerene is given as the product of the monomer ionization cross-section and a factor ma, where "m" is the number of monomers in the ensemble and "a" is a constant. A comparison between our calculations and the available experimental data reveals good agreement for q=0, 1, and 3. In the case of the ionization of C602+ (q=2), our calculation lies significantly below the measured cross-section which we interpret as an indication that additional indirect ionization processes are present for this charge state.

Original languageEnglish (US)
Pages (from-to)1-8
Number of pages8
JournalInternational Journal of Mass Spectrometry
Volume223-224
DOIs
StatePublished - Jan 15 2003

Keywords

  • Cluster
  • Electron impact
  • Fullerenes
  • Ionization cross-sections

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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