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The authors have already very briefly recorded some observations on the spectrum of PD; in the present communication these results are described in more detail. The spectrum of phosphorus deuteride has been obtained from a large water-cooled discharge tube containing phosphorus in an atmosphere of deuterium. The tube was excited by a D. C. generator and carried a current of about 0.5 amperes at 1500 volts. Details of the experimental arrangements will be given in a later paper containing the complete analysis of the spectrum. The intensity obtained was such that exposures of from 1-2 hours gave satisfactory photographs in the 4th order of the 10-foot concave grating. The spectrum of PD, like that of PH, consists of one intense band near λ 3400, which shades off in both directions and contains five maxima of intensity. The maxima are, however, much more sharply defined for PD. The λ 3400 band of PH, which was described in an earlier communication, was analysed from plates taken in the 2nd order of the grating. It has now been rephotographed in the 4th order for more accurate comparison with PD.

Spin coupling in 3 Σ states of PH and PD

Spin coupling in ³ Σ states of PH and PD