Abstract
Level-crossing spectroscopy with pulsed two-photon excitation is used to determine life-times and for the first time to determine hyperfine splittings. The experiments have been performed on thalliumnP3/2 states (n=8, 9 andn=8–11 respectively). By appropriate choice of the polarization and direction of incident light — and, thereby, of the two-photon transition operator — the signal ratio of neighbouring Δm=2 crossings is altered. Thus, in the case of overlapping crossings improved resolution can be obtained without further efforts.
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