Studies in the infra-red region of the spectrum. Part III. -Infra-red absorption spectra of ammonia, phosphine and arsine

Abstract

In this part will be given a general description of the absorption bands found in these three gases, together with curves showing their occurrence in the region up to 17 μ, and evaluations of the maxima of the absorption bands. In Part IV the relationships of the bands to each other in one gas, and to corresponding bands in the other gases, where these occur, will be dicussed. A description of the apparatus is given in Part I, and of its calibration and of the general procedure in part II, Which also give the methods of obtaining the gases pure. It is only necessary, therefore, to say here that in order to get the best definition of which this prism instrument is capable, the galvanometer was maintained at its highest sensitiveness, the spectrometer slits were the galvanometer scale, the longer tubes were selected for the examination of faint bands and the shorter tubes were selected for the examination of faint bands and the shorter tubes for strong bands, and the exploration was conducted at pressures varying from 1 to 1/16 or 1/32 atmosphere.