ROTATIONAL ANALYSIS OF THE $B^{1}\Sigma^{+} - A^{1}\Pi$ SYSTEM OF $^{13}C ^{18}O^{*}$
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Date
1983
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Publisher
Ohio State University
Abstract
The $B^{1}\Sigma^{+} - A^{1}\Pi (\AA ngstr\""{o}m)$ band System of the $^{13}C^{18}O$ molecule in the region $4100 - 6500 \AA$, excited in the anode column of a hollow cathode discharge tube of special design, was recorded. Out of a total of ten bands observed, the $1-0, 1-1, 0-0, 0-1, 0-2, 0-3, 0-4,$ and $0-5$ bonds were photographed under high dispersion and the rotational analyses of these except the complex $0-0$ band carried out. Perturbations observed in the vibrational levels v = 0, 3 and 5 of the $A^{1}\Pi$ state were analyzed and information concerning the perturbing electronic states $a^{3}\Sigma^{+}$ and $e^{3}\Sigma^{-}$ was obtained. The derived rotational constants (in $cm^{-1}$) of the A and B states can be represented by the following expressions: \begin{eqnarray*} A^{1}\Pi : B_{v} &=& 1.4660 - 0.0201 \left(v+\frac{1}{2}\right).\\ B^{1}\Sigma^{+} : B_{v} &=& 1.7805 - 0.0219 \left(v+\frac{1}{2}\right).\\ \end{eqnarray*} Other molecular constants derived from the analysis will be also discussed. $^{*}$Research supported, in part by NSERC Grant No. A-2440. $^\dag$G. L. Bhale is on leave from the Bhabha Atomic Research Centre, Bombay, India.
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Author Institution: Department of Physics, Memorial University of Newfoundland St. John's Newfoundland