CFA FCT/UNL is one of the two scientific groups of Centro de Física Atómica (CFA). Most of its members belong to Faculdade de Ciências e Tecnologia da Universidade Nova de Lisboa (FCTUNL).
Modified binary encounter Bethe model for electron-impact ionization
| Title | Modified binary encounter Bethe model for electron-impact ionization |
| Publication Type | Journal Article |
| Year of Publication | 2011 |
| Authors | Guerra, M., Parente F., Indelicato P., and Santos J. P. |
| Journal | International Journal of Mass Spectrometry |
| Volume | Accepted |
| Keywords | Electron Impact, Cross sections, K-shell, L-shell, M-shell |
| Abstract | Theoretical expressions for ionization cross sections by electron impact based on the binary encounter Bethe (BEB) model, valid from ionization threshold up to relativistic energies, are proposed.The new modified BEB (MBEB) and its relativistic counterpart (MRBEB) expressions are simpler than the BEB (nonrelativistic and relativistic) expressions because they require only one atomic parameter, namely the binding energy of the electrons to be ionized, and use only one scaling term for the ionization of all sub-shells.The new models are used to calculate the K-, L- and M-shell ionization cross sections by electron impact for several atoms with Z from 6 to 83.Comparisons with all, to the best of our knowledge, available experimental data show that this model is as good or better than other models, with less complexity. |
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