M. S. Shumate, R. T. Menzies, J. S. Margolis, and L.-G. Rosengren, "Water vapor absorption of carbon dioxide laser radiation," Appl. Opt. 15, 2480-2488 (1976)
An optoacoustic detector or spectrophone has been used to perform detailed measurements of the absorptivity of mixtures of water vapor in air. A C12O216 laser was used as the source, and measurements were made. at forty-nine different wavelengths from 9.2 μm to 10.7 μm. The details of the optoacoustic detector and its calibration are presented, along with a discussion of its performance characteristics. The results of the measurements of water vapor absorption show that the continuum absorption in the wavelength range covered is 5–10% lower than previous measurements.
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Measured at 760-Torr total pressure, 300-K temperature.
Significant absorption from ammonia observed at this frequency.
Corrected by subtracting the ammonia contribution.
Significant absorption from water lines predicted at this frequency (see Ref. 2).
Table II
Absorption Coefficients of Water Vapor in Air at Three Water Vapor Partial Pressures: 9.4-μm Band of the C12O216 Laser
Measured at 760-Torr total pressure, 300-K temperature.
Significant absorption from ammonia observed at this frequency.
Corrected by subtracting the ammonia contribution.
Significant absorption from water lines predicted at this frequency (see Ref. 2).
Table III
Comparison of Water Vapor Absorption Measurements at the C12O216 Laser P(20) Line, 10.59 μm
Measured at 760-Torr total pressure, 300-K temperature.
Significant absorption from ammonia observed at this frequency.
Corrected by subtracting the ammonia contribution.
Significant absorption from water lines predicted at this frequency (see Ref. 2).
Table II
Absorption Coefficients of Water Vapor in Air at Three Water Vapor Partial Pressures: 9.4-μm Band of the C12O216 Laser
Measured at 760-Torr total pressure, 300-K temperature.
Significant absorption from ammonia observed at this frequency.
Corrected by subtracting the ammonia contribution.
Significant absorption from water lines predicted at this frequency (see Ref. 2).
Table III
Comparison of Water Vapor Absorption Measurements at the C12O216 Laser P(20) Line, 10.59 μm