Absolute Auger Yield Measurements of P+, O+, N+, C+, and B+ Projectiles Following Foil Excitation

Absolute K-and L-shell vacancy fractions of 50 to 500 keV P+-, O+-, N+-, C+-, and B+-ions excited by thin carbon foils have been measured using the technique of Auger-electron spectroscopy. The fraction of inner-shell vacancies in the excited projectile ions is proportional to the absolute Auger yield for low Z atoms. The projectile energy dependence of the vacancy fractions is duscussed.