Abstract

The hyperfine-structure separations of Tl203 and Tl205 in the 72S12 state were obtained from the 3776-A resonance line with a grating spectrograph. These measurements were carried out because previously quoted values resulted from a study of the 5350-A transition ending on the 62P32 state, the hyperfine structure of which was inferred to be 8 mk, while recent atomic-beam magnetic-resonance experiments showed Δν(62P32)17 mk. Our results for Δν(72S12) are 405±5 mk and 412±4 mk for Tl203 and Tl205.

© 1959 Optical Society of America

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