Auger spectra excited in collisions of fast phosphorus ions with thin carbon foils

Auger-electron spectra have been measured following excitation of 100-500-keV phosphorus ions by thin carbon foils. The spectra are rich in structure mostly due to Augersatellite transitions. The composition of the Auger spectrum is interpreted with the aid of nonrelativistic Hartee-Fock calculations. In the low-energy portion, several lines could be identified. Based on calculated energies for groups of Auger transitions, the high-energy part can also be interpreted. We observe a general increase of the highenergy feature—distinct peaks as well as the gross structure—with decreasing projectile velocity. Two processes may be responsible for this variation: the enhanced production of double $L$ vacancies and the increased capture of target electrons into excited levels of the projectile ions.