Abstract
l-mixing collisions Li(n/sup 2/D)+X..-->..Li(n/sup 2/L,L>2)+X induced in Rydberg states of lithium (n = 4,5,...,13) by rare-gas atoms or Li ground-state atoms are studied in a heat-pipe arrangement. The l-mixing cross sections deduced from the time analysis of the n/sup 2/D laser-induced fluorescence agree with experimental values obtained with the heavier alkali-metal atoms and with different theoretical models developed for quasielastic Rydberg-electron--target collisions. Quenching of the n/sup 2/D fluorescence at higher rare-gas pressures is interpreted as inelastic collisional transfer of the L> or =1 mixed states to the nonhydrogenic S sublevel. Finally the radiative lifetimes of the n/sup 2/D states and n/sup 2/L mixed states with L> or =1 are deduced, respectively, from the low-pressure limit and intermediate-pressure study of the n/sup 2/D fluorescence relaxation rate.
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