Infrared collision-induced absorption by O2 near 6.4 microm for atmospheric applications: measurements and empirical modeling.
Accurate measurements of collision-induced absorption by O(2) and O(2)-N(2) mixtures in the fundamental band near 6.4 microm have been made. A Fourier-transform spectrometer was used with a resolution of 0.5 cm(-1). Absorption has been investigated in the 0-20-atm and 193-293 K pressure and temperature ranges, respectively. The current measurements confirm that the broad O(2) continuum carries small features whose attribution is not yet clear. Available experimental data in the 190-360 K temperature range have been used to build a simple, low cost computer, empirical model that is well adapted for computation of atmospheric O(2) absorption. Tests show that it is accurate, contrary to predictions of widely used atmospheric transmission codes.
Thibault
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F
Département de Physique Atomique et Moléculaire, Campus de Beaulieu, 35042 Rennes Cedex, France.
Menoux
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Le Doucen
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Rosenmann
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Hartmann
J M
JM
Boulet
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C