THE DETERMINATION OF $C$$_0$ (OR $A$$_0$), $D$$_0^K$, $H$$_0^K$, AND SOME DARK STATES FOR SYMMETRIC-TOP MOLECULES FROM INFRARED SPECTRA WITHOUT THE NEED FOR LOACALIZED PERTURBATIONS
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Publisher:Ohio State University
Several different combinations of allowed and apparently unperturbed rovibrational transitions are used to obtain the $K$-dependent rotational constants, $C$$_0$, $D$$_0^K$, and $H$$_0^K$. A necessary ingredient for the application of this technique is a band with selection rules $\Delta$$k$ = $\pm$1, $\Delta$$l$ = $\mp$2, and appropriate hot or difference bands. Examples are given for boron trifluoride (BF$_3$), sulfur trioxide (SO$_3$), and cyclopropane (C$_3$H$_6$) for which there are microwave measurements that provide a check on the derived constants. Examples are also given for the determination of dark states from difference bands, and/or hot bands, and also whole forbidden bands that arise from mixing with distant energy levels.
Author Institution: 15012 24th Ave. S.E., Mill Creek, WA 98012-5718; National Institute of Standards and Technology, Gaithersburg, MD, 20899-8393; Pacific Northwest National Laboratory, P.O. Box 999, Mail Stop K8-88, Richland, WA 99352; Department of Chemistry, Oregon State University, Corvallis, OR 97331-4003; National Institute of Standards and Technology, Gaithersburg, MD 20899-8393