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Quasi-random narrow-band model fits to near-infrared low-temperature laboratory methane spectra and derived exponential-sum absorption coefficientsNear-infrared 10/cm resolution spectra of methane obtained at various temperatures, pressures, and abundances are fit to a quasi-random narrow-band model. Exponential-sum absorption coefficients for three temperatures (112, 188, and 295 K), and 20 pressures from 0.0001 to 5.6 bars, applicable to the cold environments of the major planets, are then derived from the band model for the 230 wavelengths measured from 1.6 to 2.5 microns. RMS deviations between the laboratory and the exponential-sum synthetic transmissions are reported for the best fitting 50 wavelengths. Deviations relevant to broadband, 1-percent spectral resolution observations are also presented. The validity of exponential-sum coefficients derived from broadband (10/cm) transmission data is demonstrated via direct comparison with line-by-line calculations. The complete atlas of coefficients is available from the Planetary Data System-Planetary Atmospheres Discipline Node.
Document ID
19930049240
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Baines, Kevin H.
(Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
West, Robert A.
(JPL Pasadena, CA, United States)
Giver, Lawrence P.
(NASA Ames Research Center Moffett Field, CA, United States)
Moreno, Fernando
(Andalucia Inst. de Astrofisica, Granada, Spain)
Date Acquired
August 16, 2013
Publication Date
March 25, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: E3
ISSN: 0148-0227
Subject Category
Lunar And Planetary Exploration
Accession Number
93A33237
Distribution Limits
Public
Copyright
Other

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