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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Date
1992
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Publisher
Ohio State University
Abstract
Foreign gas effects by $Ar_{1}$ $N_{2}$, $O_{2}$, and air (broadening and frequency shifts) of several rovibrational lines of $H_{2}O$ in the $\nu_{2}$ 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 $N_{2}$ and $O_{2}$ Coefficients. The line broadening with Ar was found to be much smaller than for $N_{2}$ $O_{2}$. Collisional narrowing phenomena were clearly observed for some of the high J $H_{2}O$ lines. On the contrary, line shifts due to Ar are found to be as large as those to $N_{2}$ or $O_{2}$. The experimental procedures and the determined line broadening-and shift-parameters will be presented.
Description
Author Institution: I. Physikalisches Institut, Universit\'{a}t Zu K\""{o}ln