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Calculation of absolute electron-impact ionization cross-sections of dimers and trimers |
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| Authors: | H Deutsch K Becker TD Märk |
| Institution: | Institut für Physik, Ernst Moritz Arndt Universit?t, Domstr. 10a, 17487 Greifswald, Germany, DE Department of Physics, Stevens Institute of Technology, Hoboken, NJ 07030, USA, US Institut für Ionenphysik, Leopold Franzens Universit?t, Technikerstr. 25, 6020 Innsbruck, Austria, AT |
| Abstract: | 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. Received 6 December 1999 and Received in final form 10 April 2000 |
| Keywords: | 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 |
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