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Water vapor absorption spectra12/7/2023 ![]() In addition, the causes of the continuum remain a subject of controversy. Historically, most attention has focused on the 8–12 μm (mid-infrared) atmospheric window, where the continuum is relatively well-characterised, but there have been many fewer measurements within bands and in other window regions. The continuum absorption in the window regions is of particular importance for the Earth’s radiation budget and for remote-sensing techniques that exploit these windows. It is present within the rotational and vibrational–rotational bands of water vapour, which consist of large numbers of narrow spectral lines, and in the many ‘windows’ between these bands. Application of the line shape to other spectral regions including 4 μm and near millimeter wavelengths will be discussed.read more read lessĪbstract: The water vapour continuum is characterised by absorption that varies smoothly with wavelength, from the visible to the microwave. The predicted absorption near 10 μm decreases with increasing temperature, although the rate of decrease is not as rapid as measurement would indicate. Increasing the boundary region does not substantially increase the predicted absorption. When the line profile is applied to water vapor absorption lines within a region 1000 cm −1 from a given frequency, the predicted absorption at 296 K is in good agreement with measured 10 μm absorption at that frequency at 296 K. Both self-broadening and foreign-broadening have been included. A spectral line profile has been derived by considering collisional interactions between water vapor molecules and other perturbing molecules. Abstract: A study of the shape of water vapor absorption lines in the infrared spectral region has been made in order to determine the role of far wings in 10-μm continuum absorption.
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