### 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 C_{60}^{q+} (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 m^{a}, 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 C_{60}^{2+} (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 language | English (US) |
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Pages (from-to) | 1-8 |

Number of pages | 8 |

Journal | International Journal of Mass Spectrometry |

Volume | 223-224 |

DOIs | |

State | Published - 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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## Cite this

*International Journal of Mass Spectrometry*,

*223-224*, 1-8. https://doi.org/10.1016/S1387-3806(02)00775-3