Non-equilibrium water species as absorbers of infrared and millimetre waves

Details Non-equilibrium water species as absorbers of infrared and millimetre waves Non-equilibrium water species as absorbers of infrared and millimetre waves

Sep 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984infph..24..429g&link_type=abstract

Infrared Physics (ISSN 0020-0891), vol. 24, Sept. 1984, p. 429-436. Research supported by the Ministry of Defence (Procurement E

Physics

18

Atmospheric Attenuation, Infrared Absorption, Microwave Attenuation, Millimeter Waves, Water Vapor, Metastable State, Molecular Spectra, Nonequilibrium Conditions, Rotational Spectra, Temperature Dependence

Scientific paper

The data base on millimeter wave contributions of water vapor species to atmospheric IR radiation is examined. Observations data taken at various sites worldwide and at different altitudes have been contradictory to the predictions made based on a pure rotation spectrum and oxygen magnetic dipole absorption. Atmospheric horizontal path propagation experiments revealed an anomalous absorption phenomenon which suggested the presence of dimer water molecules. Experiments determining the speed of sound temperature dependence verified the possibility of various species at about 280 K. Equilibrium models do not predict the molecules' presence, but nonequilibrium models do, while also requiring additional energy sources. The sources could be identified if factors other than temperature and water partial pressure are studied. The investigations would be useful for identifying high absorption wavenumbers which may lie in the sensitivity ranges of communications, radar and remote sensing instruments.

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