# ATMOSPHERIC WATER VAPOR ABSORPTION AT 1.3 $\mu m^{*}$

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 Title: ATMOSPHERIC WATER VAPOR ABSORPTION AT 1.3 $\mu m^{*}$ Creators: Bragg, S. L.; Kelley, J. D. Issue Date: 1985 Publisher: Ohio State University Abstract: Absorption spectra of water vapor and water vapor broadened by air have been measured at the frequency of the atomic iodine transition at 1.3 $\mu m (7603.14 cm^{-1})$. The absolute absorption cross section at $7603.14 cm^{-1}$ has been determined for each spectrum. The absorption cross section for 2 kPa of water vapor in 100 kPa air is $1.1 (\pm 0.2)\times 10 cm^{-24}$ at $7603.14 cm^{-1}$. All absorption at this frequency is attributed to the wings of nearby water vapor lines. A theoretical model, based on pressure broadening coefficients determined in this study, yields a simple expression for the absorption cross section at $7603.14 cm^{-1}$. $\sigma = 5.0 \times 10^{-26}(p_{H_{2}0} + 0.25 p_{air})$ with p the pressure in kPa, and the cross section $\sigma$ in $cm^{2}$. Description: $^{*}$ This work was supported by Air Force Weapons Laboratory Contract F29601-82-C-0019. Author Institution: McDonnell Douglas Research Laboratories; McDonnell Douglas Research Laboratories URI: http://hdl.handle.net/1811/12211 Other Identifiers: 1985-TA-7