Abstract

The hollow cathode spectrum of cadmium has been observed over the wave-length range from 600A to 6500A. In Cd I the <sup>3</sup><i>D</i> series has been resolved and extended. In Cd II the work of von Salis and Takahashi has been corrected and considerably extended. The <sup>2</sup><i>P</i> and <sup>2</sup><i>F</i> series are very perturbed by the overlapping 4<i>d</i><sup>9</sup>5<i>s</i>5<i>p</i> configuration which is nearly complete. No series terms have been found in the 4<i>d</i><sup>9</sup>5<i>sns</i> series. Cd III is excited very strongly in the discharge and the analysis is now much extended. The odd terms are from 4<i>d</i><sup>9</sup>5<i>p</i> and they combine with 4<i>d</i><sup>10</sup>, 4<i>d</i><sup>9</sup>5<i>s</i>, 4<i>d</i><sup>9</sup>6<i>s</i>, 4<i>d</i><sup>9</sup>5<i>d</i>, and 4<i>d</i><sup>8</sup>5<i>s</i><sup>2</sup>. An ionization potential of 37.6 volts can be calculated from the 4<i>d</i><sup>9</sup><i>ns</i> series.

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