Water vapor continuum absorption in the 3.5-4.0-micrometer region

Details Water vapor continuum absorption in the 3.5-4.0-micrometer region Water vapor continuum absorption in the 3.5-4.0-micrometer region

Sep 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apopt..17.2711w&link_type=abstract

Applied Optics, vol. 17, Sept. 1, 1978, p. 2711-2720.

Physics

Optics

7

Atmospheric Windows, Electro-Optics, Infrared Absorption, Infrared Windows, Water Vapor, Absorption Spectra, Atmospheric Attenuation, Continuums, Infrared Spectra, Line Spectra

Scientific paper

Measurements of water vapor continuum absorption in the 3.5-4.0-micrometer region are presented. The measurements were made with both long-path absorption cell and spectrophone systems. A deuterium fluoride grating tunable laser was the IR source. Measurements were made at 23 C and 65 C with 14.3 torr and 65 torr of water vapor, respectively, buffered to 760-torr total pressure by an 80/20 mixture of N2/O2. Both natural water and a special sample of deuterium depleted water (one-fiftieth the normal concentration) were used. The 65 C results agree with previous measurements by other workers. The 23 C results indicate a continuum absorption at this temperature about a factor of 2 larger than expected based on the extrapolation scheme and high-temperature data of others.

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