Collision-induced transitions between electronic states B→A and C→B of laser-excited Li2 molecules

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Abstract
Nonradiative transitions between the Li2 (C 1Πu, B 1Πu, A 1Σ+u) states have been studied using monochromatic laser excitation. In a cell experiment under single‐collision conditions, the B–A transfer was induced by rare gas atom collisions. With argon, the cross section is 240 Å2. B→A and C→B transfer by Li atom collisions was observed with cross sections of 1200 and 330 Å2, while C→B transfer is not measurably induced by argon collisions. The final state rotational‐vibrational level population distribution is very broad and non‐Boltzmann.