LASER PHOTOACOUSTIC MEASUREMENTS OF PRESSURE BROADENING IN THE 6455 {\AA} $NH_{3}$ AND 6190 {\AA} $CH_{4}$ ROTATION-VIBRATION BANDS
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Date
1977
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Ohio State University
Abstract
We have obtained spectra of individual rotation-vibration lines in the tentatively identified $5\nu_{1}$ band of ammonia near 6450 {\AA} from pressures of 20 to 380 Torr, and the tentatively identified $5\nu_{1} + \nu_{3}$ band of $CH_{4}$ at $6190$ {\AA} from pressures of 80 to 1200 Torr. We utilized a resonant photoacoustic detection cell placed inside the cavity of a tunable dye laser mechanically chopped at approximately 2500 Hz. The application of such measurements to the study of planetary atmospheres and use of these transitions in selective photo-excitation will be discussed.
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This work is supported by NSF Grant AST 75-22912 and NASA Grant NGR 31-001-242.
Author Institution: Princeton University Observatory; McDonnell Center for Space Sciences, Washington University
Author Institution: Princeton University Observatory; McDonnell Center for Space Sciences, Washington University