The principal series of magnesium has been photographed, in absorption, in the ultra-violet region between 2400 Å and 1600 Å by means of a 3-metre vacuum spectrograph and a large King furnace. Measurement of twenty-four new members of the series against accurate copper standards leads to a revised value of 61670.6 cm -1 for the ionization potential of Mg I, an increase of 1.5 cm -1 on the value previously accepted.
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K. Codling (1961) studied this question.
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