https://doi.org/10.1007/s100530070023
Calculation of absolute electron-impact ionization cross-sections of dimers and trimers
1
Institut für Physik, Ernst Moritz Arndt Universität, Domstr. 10a,
17487 Greifswald, Germany
2
Department of Physics, Stevens Institute of Technology, Hoboken, NJ 07030, USA
3
Institut für Ionenphysik, Leopold Franzens Universität, Technikerstr. 25,
6020 Innsbruck, Austria
4
Dept. Plasmaphysics, Univerzita Komenskeho, Mlynska dolina,
842 15 Bratislava 4, Slovensko
Received:
6
December
1999
Revised:
10
April
2000
Published online: 15 November 2000
We report calculations of the electron-impact ionization cross-sections of selected dimers (homonuclear diatomic molecules) and trimers (homonuclear triatomic molecules) using a method which relies only on macroscopic quantities in conjunction with a "defect concept". The empirically determined defect describes the deviation of the cluster (dimer, trimer) cross-sections from a simple linear dependence on the cluster size. We compare the calculated cross-sections to experimental data for the dimers S2 and F2 and the trimer O3 and we present predictions for the ionization cross-sections of Br2, I2, C2 and C3 for which no experimental data are available. Lastly, we extend the method to the calculation of ionization cross-sections for the fullerenes C60 and C70.
PACS: 34.50.Gb – Electronics excitation and ionization of molecules; intermediate molecular states (including lifetimes, state mixing, etc.) / 34.80.Dp – Atomic excitation and ionization by electron impact
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000
