R. Cranos, M. Shaw, F. Long, K. Miller, E. Damon, R. Nordstrom
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FT-IR Measurements of Cryo-Condensed Inert Trace Air Pollutants*
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. Hanst1,2 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.
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