On the hyperfine structure of the mesospheric water vapour line /22 GHz/

Details On the hyperfine structure of the mesospheric water vapour line /22 GHz/ On the hyperfine structure of the mesospheric water vapour line /22 GHz/

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1029g&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Sept. 1978, p. 1029, 1030.

Physics

Hyperfine Structure, Line Spectra, Mesosphere, Microwave Spectra, Water Vapor, Absorption Spectra, Emission Spectra, Masers, Solar Radiation

Scientific paper

Model calculations of the hyperfine structure splitting of the mesospheric water vapor line at 22.2351 GHz are examined. While the vapor line was observed with the 120-ft Haystack antenna in conjunction with a cooled ruby maser, it is suggested that detection of the hyperfine structure splitting will be extremely difficult unless the constitution of the atmosphere deviates considerably at high altitudes from presently accepted models. Hyperfine structure calculations for two mixing ratios are presented. The mesospheric water vapor line, seen in emission and absorption against the sun, has a typically pressure-broadened profile.

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