ISSN:
1434-6079
Schlagwort(e):
34.50.Hc
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Physik
Notizen:
Abstract We have determined effective cross-sections for resonant transfer of excitation energy from state-selected Li2 molecules to ground state Li atoms $$Li_2 A\left( {\upsilon ',J'} \right) + Li2S \to Li_2 X\left( {\upsilon '',J''} \right) + Li2P$$ 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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01436686
