Recent Investigations in the Far Infra-Red

Abstract

Experiments have been carried out in the far infra-red region from 100 to 600 microns using a grating spectrograph with crystal quartz optics. These experiments include measurement of the transmission of the atmosphere for paths up to 8 meters, the measurement of the transmission of various solid substances, and the observation of the longest wave-length pure rotation lines in the spectra of ammonia and hydrogen chloride.