SUPERSONIC FREE-JET QUANTUM CASCADE LASER MEASUREMENTS OF $\nu_4$ FOR CF$_3^{35}$Cl AND CF$_3^{37}$Cl AND FTS MEASUREMENTS FROM 400 TO 1260 cm$^{-1}$
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Date
2008
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Publisher
Ohio State University
Abstract
A supersonic free-jet spectrum of the $\nu_4$ band of CF$_3$Cl has been measured using a quantum cascade laser system. Those measurements were combined with a low temperature (-67 C) FTS spectrum of the region 1060 to 1260 cm$^{-1}$ to give improved values for the rovibrational constants for the $\nu_1$, 2$\nu_5$, and $\nu_4$ states of the CF$_3^{35}$Cl AND CF$_3^{37}$Cl. The principal perturbation found by earlier investigators in the $\nu_1$ band is treated as a very weak Coriolis interaction at several avoided crossings of the rotational levels of the $\nu_1$ state and the 2$\nu_5$ state with {\em kl} $<0$. Room temperature FTS measurements were also made for the region 400 to 970 cm$^{-1}$. With these new measurements we now have high resolution data on the states $\nu_1$, $\nu_2$, $\nu_3$, $\nu_4$, and $\nu_5$. Also included in this analysis are the overtones 2$\nu_3$ and 2$\nu_6$ and a few hot bands.
Description
Author Institution: Pacific Northwest National Laboratory, P. O. Box 999, Mail Stop K8-88, Richland, WA 99352 (PNNL is operated for the US Department of Energy by the Battelle Memorial Institute under contract DE-AC05-76RL0 1830); 15012 24th Ave. S.E., Mill Creek, WA 98012