Abstract
We have measured the alignmentA 20 of Ar+(2p −1 2 P 3/2) ions after electron impact ionization in the range of primary electron energyE 0=1000...268 eV (range of excess energyE 1=750...19.5 eV) via the anisotropic angular distribution ofL 3−M 2,3 M 2,3(1 S 0) Auger electrons. On decomposing the Auger spectra into their components special care was taken by including the effect of the postcollision interaction on the shape of Auger lines. The present alignment values forE 0≧350 eV agree well with previously existing experimental values of DuBois and Rodbro and with theoretical DWBA results of Berezkho and Kabachnik, but forE 0<350 eV they deviate systematically from the DWBA values. For the lowest impact energyE 0, which is only 19.5 eV above threshold, we obtainedA 20=+0.09(16). This value clearly indicates that in the ionisation process near threshold the two low-energy electrons escape not only with a two-electron partial waveL=0, according to Wannier's original assumption, but also with partial wavesL>0.
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Weber, W., Huster, R., Kamm, M. et al. Alignment of Ar+ (2p −1 2 P 3/2) ions after electron impact ionisation in the range 1 keV to 268 eV. Z Phys D - Atoms, Molecules and Clusters 22, 419–424 (1991). https://doi.org/10.1007/BF01438567
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DOI: https://doi.org/10.1007/BF01438567