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A line tunable deuterium fluoride laser was used to measure the pressure dependence of the water vapor continuum absorption at 25 degree C in the 3.5-4.0- μm spectral region. From measurements of the absorption of 14.3 Torr od deuterium depleted water vapor buffered by several air-broadening pressures, an unexpectedly small foreign-to-self-broadening coefficient of 0.011 with a factor of 2 uncertainty as well as an unusually strong self-contribution for the water vapor continuum absorption were observed. These measurements can be used to infer contributions to the water vapor continuum in the 3-5-μm window from both far wing and aggregate-water-molecule type absorptions.
