The Infra-Red Absorption Spectrum of Hydrogen Sulphide

Abstract

The infra-red absorption bands of hydrogen sulphide in the regions of 4.2, 5.6, and 8.0\ensuremath{\mu} were investigated by means of a prism-grating spectrometer. A narrow, intense absorption band was observed at 4.2\ensuremath{\mu}, but could not be resolved. The 5.6\ensuremath{\mu} band observed by Coblentz was not found. Evidence is presented to show that the band observed by Coblentz might have been due to an impurity. Thirty-four lines of the band in the region of 8.0\ensuremath{\mu} were observed.