Abstract
Based on Doppler-free optical double-resonance polarization spectroscopy, line broadening and line shifts of Rydberg transitions in Li 2, caused by inelastic and elastic collisions and by saturation effects have been investigated. Total collision cross sections up to 6000 Å 2 for line broadening and up to 1600 Å 2 for line shifts have been observed. Collisions of Li 2 Rydberg molecules with Li atoms are much more effective than those with Ar atoms. From the extrapolation of measured line widths to zero pressure, surprisingly short lifetimes of Rydberg levels are deduced and discussed.
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