(e, 3e) angular distributions from the double ionization of krypton at approximately 5.5 keV impact energy have been measured under different kinematical conditions. The original method utilized for the absolute scale determination is discussed in detail. General features and possible trends of the distributions are outlined.

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Energy loss spectra over a large energy loss range have been obtained for Ar using high energy electron impact spectroscopy. The sums of the generalized oscillator strengths for all possible excitation and ionization transitions have been determined separately for the L+M and K shell electrons relative to the Bethe sum rule for the whole atom. The effective number of electrons NK in the K shell of Ar was determined and found to be the same as theoretical predictions and experimental determinations for dipole oscillator strengths. (AIP)