Abstract

The most active field in low temperature spectroscopy in recent years has been known as a new method spectroscopy of solutions in liquefield gases, such as inert gases, nitrogen and oxigen. As a rule, the Absorption bands are very sharp, so that accurate frequency measurements are possible. The decrease of band overlapping makes intensity measurements much more reliable and it is often possible to obtain more accurate virational terms than from the gas phase spectra because of the absence of the rotational structure in the vibrational bands. Therefore, it is one of the best analytical methods for the pure samples.