Abstract
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.
Original language | English |
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Pages (from-to) | 1154-1156 |
Number of pages | 3 |
Journal | Physical Review Letters |
Volume | 35 |
Issue number | 17 |
DOIs | |
State | Published - 1975 |