Spectroscopy at Extreme Infra-Red Wavelengths. III. Astrophysical and Atmospheric Measurements

Details Spectroscopy at Extreme Infra-Red Wavelengths. III. Astrophysical and Atmospheric Measurements Spectroscopy at Extreme Infra-Red Wavelengths. III. Astrophysical and Atmospheric Measurements

Apr 1964

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1964rspsa.278..543b&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 278, Issue 1375, pp. 543-573

Physics

19

Scientific paper

Observations of solar, lunar and atmospheric radiation between 1 and 4 mm wavelength are described. The optical arrangement employed parabolic reflecting telescopes with Golay cells as detectors and gauzes or objective gratings for wavelength selection. The atmospheric results include measurements of transmission through various types of cloud and also the detection of an absorption line at about 1\cdot6 mm which is almost certainly the 3-2-2_2 pure rotation line of water predicted by Van Vleck. More generally the atmospheric measurements confirm earlier experimental results showing that the absorption due to the tails of submillimetre absorption lines is greater than that predicted by Van Vleck. Some direct laboratory measurements have been made of pressure broadening of the water vapour line at 0\cdot538 mm. Combined solar and lunar measurements give an effective solar temperature of 5800 ^circK at 1cdot3 mm and 6700 ^circK at 2\cdot5 mm wavelength and a value of δ = 0\cdot36 for the ratio of thermal to electromagnetic attenuation coefficients for lunar surface material.

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