Abstract

Many of the atmospheric gaseous pollutants which may affect the environment, such as chlorofluorocarbons, occur at concentrations between 1 ppt and 1 ppb. A number of methods to identify these pollutants and to determine their abundance quantitatively have been proposed. Hanst^1,2 has described a cryogenic concentration technique which can provide quantitative estimates for a number of relatively inert gases which occur at the ppb level¹’² by using infrared spectroscopy.

© 1980 Optical Society of America