Measured and predicted atmospheric transmission in the 4.0-5.3-micron region, and the contribution of continuum absorption by CO2 and N2

Details Measured and predicted atmospheric transmission in the 4.0-5.3-micron region, and the contribution of continuum absorption by CO2 and N2 Measured and predicted atmospheric transmission in the 4.0-5.3-micron region, and the contribution of continuum absorption by CO2 and N2

Jul 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apopt..18.2454b&link_type=abstract

Applied Optics, vol. 18, July 15, 1979, p. 2454-2461. Research sponsored by Aerodyne Research and U.S. Air Force.

Physics

Optics

11

Absorption Spectra, Atmospheric Attenuation, Continuous Spectra, Light Transmission, Sunlight, Transmittance, Atmospheric Models, Carbon Dioxide, High Resolution, Nitrogen, Van Der Waals Forces

Scientific paper

High resolution measurements of atmospheric transmission of sunlight from space to altitudes of 12.2 km, 8.53 km, and 5.48 km made over Johnston Island are reported. The spectral region covered is 4.0-5.3 microns. Comparisons of the measured transmission with theoretically synthesized transmission curves are presented. It is shown that the sharp spectral features due to molecular line-by-line absorption can be predicted accurately while the modeling of the continuum absorption features needs further development. A discussion of the current models for CO2 and N2 continuum absorption is presented. An alternative mechanism is proposed for continuum absorption, which is based on the spectral properties of atmospheric van der Waals molecular complexes such as CO2.N2 and N2.N2 dimers.

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