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Measured-predicted molecular spectra at band-line resolution.

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Title: Measured-predicted molecular spectra at band-line resolution.
Authors: Freeman, G.N.1 newt.freeman@gmail.com, Akagi, T.1, Barton, P.B.C.1
Source: Journal of Quantitative Spectroscopy & Radiative Transfer. Oct2016, Vol. 182, p305-323. 19p.
Subjects: Molecular spectra, Energy bands, Cold gases, Absorption spectra, Spectral line broadening, Carbon dioxide, Transmittance (Physics)
Abstract: Early ERIM measurements of hot-through-cold gas (CO 2 , H 2 O, N 2 ) emission-absorption spectra are replicated by modern line-band computations that incorporate independent fundamental line strength-frequency information. Close agreement is achieved for all cases by empirical adjustment of the line broadening function. Line spectra for CO 2 and H 2 O computed at 0.001 cm −1 resolution were integrated to 3.2 and 14 cm −1 using a triangular slit function consistent with ERIM measurements for the 4.3 and 2.7 μm spectral regions. Band spectra computed at 0.1 cm −1 resolution give close agreement with spectra generated at higher resolution. The findings demonstrate a merged line-band model for nonuniform path radiance and transmittance based on the line-sum spectral cross section for each piecewise-uniform path segment. The band-and-line transmittance become equivalent at high spectral resolution. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Early ERIM measurements of hot-through-cold gas (CO 2 , H 2 O, N 2 ) emission-absorption spectra are replicated by modern line-band computations that incorporate independent fundamental line strength-frequency information. Close agreement is achieved for all cases by empirical adjustment of the line broadening function. Line spectra for CO 2 and H 2 O computed at 0.001 cm −1 resolution were integrated to 3.2 and 14 cm −1 using a triangular slit function consistent with ERIM measurements for the 4.3 and 2.7 μm spectral regions. Band spectra computed at 0.1 cm −1 resolution give close agreement with spectra generated at higher resolution. The findings demonstrate a merged line-band model for nonuniform path radiance and transmittance based on the line-sum spectral cross section for each piecewise-uniform path segment. The band-and-line transmittance become equivalent at high spectral resolution. [ABSTRACT FROM AUTHOR]
ISSN:00224073
DOI:10.1016/j.jqsrt.2016.05.030