THE EFFECT OF FOREIGN-GAS BROADENING ON THE TOTAL ABSORPTION BY THE 2.7$\mu$ BANDS OF WATER VAPOR AND CARBON $DIOXIDE^{*}$

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1954

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Ohio State University

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The total absorption of the 2.7-micron bands of water vapor and of carbon dioxide has been measured with a low-resolution spectrometer and a 22-meter, multiple traversal cell. Water vapor concentrations between 0.01 and 2 precipitable centimeters in the absorption path, and carbon dioxide concentrations between 5 and 1850 atm-cm, respectively, have been studied. In addition, the absorbing gas was pressure-broadened with nitrogen to various total pressures up to atmospheric pressure. Temperature was not varied in this study. With this apparatus, the absorption path length, the partial pressure of the absorbing gas, and the total pressure can be varied independently, and the effects of self-broadening and foreign-gas broadening can be separately evaluated. Runs have also been made with mixtures of these two absorbers. Empirical relationships have been fitted to these data in order to permit the calculation of the total absorption by these bands for many problems of meteorological interest.

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$^{*}$This work was supported by the Air Force Cambridge Research Center.
Author Institution: Department of Physics, The Ohio State University

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