Absolute cross sections for electron impact ionization of Ag2 |
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Authors: | K Franzreb A Wucher H Oechsner |
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Institution: | 1. Fachbereich Physik and SFB 91, Universit?t Kaiserslautern, W-6750, Kaiserslautern, Federal Republic of Germany
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Abstract: | The previously measured relative cross section function for electron impact ionization (EII) of neutral Ag2 has now been calibrated quantitatively by combining the electron impact ionization with in situ non resonant two photon ionization (NR2PI). By comparing the NR2PI saturation intensities measured for Ag 2 + and Ag+ with the corresponding EII intensities, the ratio between the electron impact ionization cross sections (EIICS) of neutral Ag2 and Ag was determined to be σAg2/σAg=1.53 for an electron energy of 46 eV. This result agrees well with the geometricn 2/3-rule \((\sigma X_n \sim n^{2/3} )\) commonly proposed for the dependence of the EIICS of clustersX n on the cluster sizen. |
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