Kenneth O. White,2
Wendell R. Watkins,2
Charles W. Bruce,2
Robert E. Meredith,1
and Frederick G. Smith1
1Science Applications, Inc., Ann Arbor, Michigan 48103
2The other authors are with U.S. Army Electronics Research & Development Command, Atmospheric Sciences Laboratory, White Sands Missile Range, New Mexico 88002.
Kenneth O. White, Wendell R. Watkins, Charles W. Bruce, Robert E. Meredith, and Frederick G. Smith, "Water vapor continuum absorption in the 3.5–4.0-μm region," Appl. Opt. 17, 2711-2720 (1978)
Measurements of water vapor continuum absorption in the 3.5–4.0-μm 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 (≥65°C) of others.
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