The N2-broadened water vapor absorption line shape and infrared continuum absorption. I - Theoretical development. II - Implementation of the line shape

Details The N2-broadened water vapor absorption line shape and infrared continuum absorption. I - Theoretical development. II - Implementation of the line shape The N2-broadened water vapor absorption line shape and infrared continuum absorption. I - Theoretical development. II - Implementation of the line shape

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jqsrt..28...81t&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer, vol. 28, Aug. 1982, p. 81-101, 103-112.

Physics

27

Absorption Spectra, Atmospheric Attenuation, Infrared Absorption, Line Spectra, Nitrogen, Water Vapor, Absorptivity, Carbon Dioxide, Hamiltonian Functions, Molecular Collisions, Statistical Analysis, Troposphere

Scientific paper

A total infrared line shape for nitrogen-broadened water vapor absorption which is valid under tropospheric conditions is derived and applied to experimental data. The line shape is obtained for the conditions of self-broadening through the electric dipole-dipole interaction and foreign-broadening through the electric dipole-quadrupole interaction, under assumptions of binary collisions, adiabaticity, retention of only the leading terms of the intermolecular potential multipole expansion, a small collision Hamiltonian in relation to molecular energies, and a total line shape represented by the smooth blending of the near line center and far wing parts. The spectral line profile, which demonstrates the importance of far wing phenomena, is implemented for the 8-14 and 3.5-4 micron atmospheric transmission windows observed by laser spectroscopy. The absorption line shape is found to be in good agreement with observations correctly predicting the observed frequency and pressure dependence of water vapor absorption throughout the IR.

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