A method has been developed for observing absorption spectra of high melting point materials in the Schumann region. The absorption spectra of manganese and silver have been investigated in the region between λ800A and λ1930A. Many new lines in MnI have been observed and it has been possible to link some of these with known levels in the Mn atom. A new sequence of terms, the d⁹snp⁶P⁰, has been found in AgI.
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F. Paul (1937) studied this question.
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