We have demonstrated that quantum selected populations of He(2S1) can be converted completely to ionization by single-photon excitation to He(3P1) followed by collision-induced associative ionization. For helium pressures between 15 and 100 Torr, saturation of ionization was observed whenever a tunable dye laser produced more than 0.1 J/pulse. Absolute numbers of He(2S1) per ion pair formed from proton interaction and the decay rates of He(2S1) support a recent energy-pathways model.
ASJC Scopus subject areas
- General Physics and Astronomy