The Zeeman effect in the Ba I absorption spectrum has been observed by Garton and Tomkins. One striking feature of the spectrum they obtained is the existence of a sequence of a lines, extending across the zero-field series limit into the continuum, with a regular spacing of about 1 .Shw, where w is the cyclotron frequency. A semiclassical explanation is given for this result. Subject headings: atomic processes - Zeeman effect
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R. F. O’Connell (1974) studied this question.