Single and double electron-loss cross sections of metastable- and ground-state neutral helium

Abstract

Ratios of electron-loss cross sections of metastable-state to ground-state He 0 projectiles have been measured for a collision with rare gas atoms at the energies 0.8, 1.0 and 1.5 MeV, and found to be less than and greater than unity for double electron-loss and for single electron-loss, respectively.