PRECISE MEASUREMENTS OF PRESSURE BROADENING AND SHIFT FOR SEVERAL $H_{2}O$ LINES IN THE $\nu_{2}$ BAND BY ARGON, NITROGEN, OXYGEN, AND AIR

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1992

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Ohio State University

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Foreign gas effects by Ar1 N2, O2, and air (broadening and frequency shifts) of several rovibrational lines of H2O in the ν2 band were measured precisely by using a stabilized diode laser spectrometer. The additive behaviour of the line broadening parameters is supported by separate measurements with air, oxygen, and nitrogen as foreign gas: the pressure broadening due to air can be calculated from the weighted mean of the measured N2 and O2 Coefficients. The line broadening with Ar was found to be much smaller than for N2 O2. Collisional narrowing phenomena were clearly observed for some of the high J H2O lines. On the contrary, line shifts due to Ar are found to be as large as those to N2 or O2. The experimental procedures and the determined line broadening-and shift-parameters will be presented.

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Author Institution: I. Physikalisches Institut, Universit'{a}t Zu K""{o}ln

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