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

Several different combinations of allowed and apparently unperturbed rovibrational transitions are used to obtain the $K$ -dependent rotational constants, $C$ $0$ , $D$ $0K$ , and $H$ $0K$ . A necessary ingredient for the application of this technique is a band with selection rules $Δ$ $k$ = $\pm$1, $Δ$ $l$ = $\mp $2, a n d a p p r o p r i a t e h o t o r d i f f e r e n c e b a n d s . E x a m p l e s a r e g i v e n f o r b o r o n t r i f l u o r i d e (B F$ _3 $), s u l f u r t r i o x i d e (S O$ _3 $), a n d c y c l o p r o p a n e (C$ _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.

Description

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

URI

http://hdl.handle.net/1811/31219

Collections

Abstracts of OSU International Symposium on Molecular Spectroscopy 2000-2009

Full item page

Knowledge Bank