The hyperfine structure of the 194.2 nm line of Hg II has been studied by Fabry-Pérot interferometry. The A -factors for the odd isotopes have been determined for the levels 2 S 1/2 and 2 P 1/2 and the shifts for the different isotopes in the natural mercury line have been measured.
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Guern et al. (1976) studied this question.
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