Die Winkelabhängigkeit der Resonanzstreuung niederenergetischer Elektronen an He,Ne, Ar und N2 |
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Authors: | D Andrick H Ehrhardt |
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Institution: | 1. Physikalisches Institut der Universit?t Freiburg, Deutschland
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Abstract: | The energy dependence of the elastic resonance scattering of low energy electrons from He, Ne, Ar, and N2 has been measured in the angular range from 8° to 110°. From the measurements are derived the total angular momenta and hence the configurations of the quasistationary negative ion states. The line shapes depend very strongly on the phase shifts for the potential scattering and on the interference of different partial waves. In the cases of He and Ne phase shifts are determined. The resonance structure in the elastic scattering from N2 in the energy range from 1.75 eV to about 3,5 eV seems to be due to the formation of the N 2 ? -ion in its electronic ground state with a2Π configuration. The separations of its first few vibrational states are 237±10 meV, the natural half-width of these states being approximately 150 meV. |
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