LINE STRENGTH MEASUREMENTS IN THE $\nu_2$ BAND OF $\mbox{H}_2{^{18}\mbox{O}}$
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Date
2009
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
Spectra of an $\mbox{H}_2{^{18}\mbox{O}}$ enriched sample of water vapor were recorded from 1780 to 4500~cm$^{-1}$, at room temperature, with a Bruker IFS-125 instrument and a liquid nitrogen cooled InSb detector. A single path, 24~cm long, glass cell with ZnSe windows was filled with $\mbox{H}_2{^{18}\mbox{O}}$ water vapor at 97.1\% purity from CDN Isotopes. For the various spectra, pressures ranging from 4.3 to 18.4~Torr were measured with two different MKS Baratron gauges having 10 and 100~Torr pressure limits. The unapodized spectral resolution was 0.002~cm$^{-1}$. Line strengths were retrieved from these spectra for transitions belonging to the $\nu_2$ band with the help of a computer program determining simultaneously line positions, strengths, and linewidths by nonlinear least-squares fitting. The new line strength values were analyzed with those already available for rotational transitions within the ground vibrational state~{\bf 190} (1998) 379.} and for $\nu_2$ band~{\bf 9} (1992) 462.} transitions. In order to account for the anomalous centrifugal distortion displayed by water, this line intensity analysis was performed using the Bending-Rotation Hamiltonian approach.~{\bf 251} (2008) 339.}
Description
Toth, {\em J.\ Molec.\ Spectrosc.Toth, {\em J.\ Opt.\ Soc.\ Am.\ BCoudert, Wagner, Birk, Baranov, Lafferty, and Flaud, {\em J.\ Molec.\ Spectrosc.
Author Institution: Institute of Experimental Meteorology, Lenina 82; Obninsk, Kaluga region 249020, Russia; LISA, CNRS/Universites Paris 12 et 7, 61 Avenue du; General de Gaulle, 94010 Creteil, France
Author Institution: Institute of Experimental Meteorology, Lenina 82; Obninsk, Kaluga region 249020, Russia; LISA, CNRS/Universites Paris 12 et 7, 61 Avenue du; General de Gaulle, 94010 Creteil, France