Abstract

With the exception of one 1S term, the whole number of singlet terms which theory predicts for Mn ii in the 3d6, 3d5 4s, and 3d5 4p configurations, have been discovered; they give 41 atomic energy levels: 16 even and 25 odd. It has been possible to classify a total of 167 lines, 113 being combinations among these singlet terms, and 54 intercombination lines with quintet and triplet terms, already known.

© 1956 Optical Society of America

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