The Infrared Absorption by Hydrogen Sulfide

Abstract

Two of the bands in the spectrum of H₂S identified as v₃ and v₂ have been remeasured under high dispersion. The center of the band identified as v₃ is found to be 2685 cm^—1 and is a type of band showing no single Q branch at the center and is therefore ascribed to an oscillation of the electric movement along the axis of the intermediate moment of inertia. The fundamental v₂ has been remeasured with two different gratings of different resolving power. It has been found to be of the type displaying a broad and partially resolved Q branch at the center and is henceforth identified with an oscillation of the electric moment along the axis of smallest moment of inertia. An estimate of the values of the moments of inertia has been made and these are found to agree well with those given by Cross, but the data here presented is interpreted as evidence for a model where the vertex angle is 85° rather than 92° as given by Cross.