Excitation Process of Helium Atoms by the Impact of 100-200 keV Protons

Abstract

Excitation cross sections of some states of helium by the impact of 100-200 keV protons were studied under various excitation conditions. The lateral distributions of light source were also measured. In the higher target gas pressure region, the excitation of n¹P(n＝3, 4) levels are greatly increased by the effect of the imprisonment of resonance radiations, and the 4¹, ³D and 3³P levels are also influenced by the effect of a collisional transfer. The 4¹S state is mainly excited by a direct collision with incident protons even at the higher gas pressure.