The construction and performance of a single beam large aperture spectrometer totally enclosed in a vacuum chamber are described. The focal length of the Czerny-Turner monochromator is 90 cm and plane gratings up to 23 cm x 18 cm are used. The grating drive incorporates a Merton nut. With a Golay detector, the resolution achieved is about 0.12 cm(-1) at 1000 cm(-1), 0.20-0.30 cm(-1) in the range 300-27 cm(-1) Illustrative spectra of ammonia, water vapor, and glyoxal are given.
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Cole et al. (1970) studied this question.
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