Hyperfine Structure of Hg^197 An Application of the Level-Crossing Technique*

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Abstract
Measurements in the 6 3P1 state of Hg197 yield a hyperfine structure splitting of 23 083.4±6.7 Mc. Such accuracy is possible in a strictly optical experiment because the change in intensity of scattered light observed at a Zeeman-level crossing is unaffected by Doppler broadening.