Measured-predicted molecular spectra at band-line resolution.

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]