Quenching and Trapping of Lyman-α Fluorescence at Large Optical Depths

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Abstract
Trapping times for 121.6 nm hydrogen resonance radiation in atomic hydrogen gas have been determined by a phase shift method. Rate constants for quenching of H atoms in the n = 2 level have been calculated from the measured trapping times together with the slopes of Stern–Volmer plots obtained under steady-state conditions. The results indicated that the trapping times characteristic of fluorescence decay, and of steady-state fluorescence, differed by less than a factor of two. For quenching by O2, Ar, and He, the values of quenching cross sections obtained (all × 10−16 cm2) were 30 ± 8, 0.9 ± 0.4, and 0.4 ± 0.2, respectively.

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