The Absorption Spectra of Cyclopropane, Ethylene Oxide, Ethylene Sulfide, and Ethylene Imine in the Photographic Infra-Red

Abstract

The absorption spectra of cyclopropane, ethylene oxide, ethylene sulfide, and ethylene imine have been investigated in the region between 7000 and 12,000A and the stronger bands have been assigned as third harmonics of the fundamental C☒H stretching frequencies of these molecules. Rotational fine structure was not observed under high dispersion, but the well‐defined band envelopes of the three asymmetric rotators provide interesting examples of these little investigated band types