The Third Spectrum of Copper (CuIII)

Abstract
An analysis of the second spark spectrum of copper is given. The identified levels include all those due to 3d9, 3d84s, 3d84p except the S2 and P2 based on 3d8S1. The six levels 3d8(F3)5sF4, F2 have been found and allow the calculation of an I. P. of 37.08 volts. A number of levels of 3d84d are present also, but 3d74s2, which should be lower, has not been found.

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