Cadmium Spectra

Abstract

The hollow cathode spectrum of cadmium has been observed over the wave-length range from 600A to 6500A. In Cd I the ³D series has been resolved and extended. In Cd II the work of von Salis and Takahashi has been corrected and considerably extended. The ²P and ²F series are very perturbed by the overlapping 4d⁹5s5p configuration which is nearly complete. No series terms have been found in the 4d⁹5sns series. Cd III is excited very strongly in the discharge and the analysis is now much extended. The odd terms are from 4d⁹5p and they combine with 4d¹⁰, 4d⁹5s, 4d⁹6s, 4d⁹5d, and 4d⁸5s². An ionization potential of 37.6 volts can be calculated from the 4d⁹ns series.