Deexcitation of hollow atoms autoionization of multiply excited N, O and Ne atoms at a Pt 110 surface

The K Auger electron emission during the interaction of 60 keV N6 , 70 keV O7 and 90 keV Ne9 with a Pt 110 surface occurs below the target surface for glancing angles in the range 10 90 degrees, Therefore the projectile K Auger electron spectra are distorted by solid state effects. These effects can be removed from the measured spectra by using a procedure originally developped for photoelectron spectroscopy. The resulting primary excitation spectra are compared with results of atomic structure calculations. The analysis reveals that at the instant of K Auger electron emission on the average five electrons are present in the L shells of the hydrogen like N, O and Ne projectiles. Furthermore the ratio of the KLL and KLM Auger electron emission yields is determined. It is 3.4, 3.7 and 4.6 in case of the N6 , O7 and Ne9 projectile, respectivel