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Time spectroscopy in theA 1∑ u + state of Li2
Authors:G. Baumgartner  H. P. Keller  W. Preuss
Affiliation:1. Fakult?t für Physik, Universit?t Freiburg, Federal Republic of Germany
Abstract:We have determined effective cross-sections for resonant transfer of excitation energy from state-selected Li2 molecules to ground state Li atoms $$Li_2 Aleft( {upsilon ',J'} right) + Li2S to Li_2 Xleft( {upsilon '',J''} right) + Li2P$$ with two different experimental techniques. Absolute cross-sections were derived from lifetime measurements of 114 rotational levels of theA-state subject to resonant collisions which belong to vibrational statesv′=4, 5, 6, 7 and 11 of6Li2 and7Li2. Cross-sections amount to several thousand Å2 dropping off sharply with a resonance half-width of about 16 cm?1. The resonance behaviour of the collision cross-section inferred from lifetime data could be confirmed by a double resonance technique probing the number of excited atoms with a second laser while the first laser was scanned over the Li2 X?A absorption band. Due to their high reliability our data prove a good basis for the test of theoretical models. In contrast to earlier investigations significant deviations were found to exist between the measured cross-sections and those predicted by the first-order dipole-dipole scattering theory.
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