Hyperfine Structure in Neutral Manganese, Mn I.

Abstract
Observations. The hyperfine structure patterns of some 30 or 40 lines in the spectrum of Mn I have been photographed by means of a prism spectrograph and silvered Fabry-Perot etalons. A tube, designed by Schüler, and operated at liquid air temperatures, has been used as a light source for most of the lines and a king vacuum furnace for the others. Patterns of from 2 to 6 components are found, some degrading in intensity and intervals toward low frequencies and others toward higher frequencies.

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