Abstract

There are bands in the 8–14-μm atmospheric window region of the gas phase IR spectra of α- and β-pinenes that are intense enough to allow theoretically the naturally occurring terpenes to be determined in the 100-ppbv level at 1-km path lengths. Because of the broadness of the bands, however, and the relatively intense atmospheric background at their frequencies of 786.5 cm−1 and 880 cm−1, respectively, practical concentration limits for the use of the bands are probably not better than about 1–10 ppmv. Both type C bands have 4-cm−1Q branches which fall at frequencies which are essentially free of any major atmospheric fine structure bands.

© 1979 Optical Society of America

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