The M o l d behaviour of eledmn impact ionization of argon atoms and nitrogen molecules is investigated state selectively using the vanstational energy sptromeby (ms) method. A power law of the form # ( E d ) a (Ee, -E d " can be fitted to the measured ionization fnnctions. For double ionization of Ar and Nz we found good agreement with the theoretical predictions based on the Wannier theory for the electron triple escape process. Coefficients for the triple ionization of Ar are closer to those predicted by a swistical model.
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