State selective cross sections for ionization-excitation of helium in fast H + + He and C 6++ He collisions: Z3p-dependence

Abstract

State-selective cross sections for ionization plus excitation of helium have been measured by detection of the He + Lyman series (1s- np) for n = 2−5 following bombardment of He by fast protons and C 6+ particles in the energy range of 0.83–2.3 MeV/u. The H + and C 6+ cross sections scale approximately as Z 3 p.