A nearly complete analysis of the third spectrum of nickel is given, based on 800 measured lines extending from 600 A to 3000 A. A partial term list was published in “Atomic Energy States,” National Bureau of Standards Circular No. 467, 1952. The 168 levels now given include all but 1S from 3d8, and all but the higher 1D from 3d7 4s. The discovery of the higher 3D is noteworthy. High even levels allow the calculation of an I.P.=36.16 volts. The group of odd levels due to 3d7 4p lacks only a few of low J and some members of 3d6 4s 4p are present. The important term 3d6 4s2 5D has not been found. Intensities are very irregular, especially where terms from different families are involved.
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