# DIRECT MEASUREMENTS OF THE FUNDAMENTAL ROTATIONAL TRANSITIONS OF CD AND $^{13}$CH $(X^2\Pi_r)$

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 Title: DIRECT MEASUREMENTS OF THE FUNDAMENTAL ROTATIONAL TRANSITIONS OF CD AND $^{13}$CH $(X^2\Pi_r)$ Creators: Halfen, D. T.; Ziurys, L. M.; Pearson, J. C.; Drouin, Brian J. Issue Date: 2008 Publisher: Ohio State University Abstract: The $N=1\rightarrow1$ and $N=1\rightarrow2$ rotational transitions of CD, and the $N=1 \rightarrow 1$ lines of $^{13}$CH have been measured in their $^2\Pi_r$ ground electronic states using sub-mm direct absorption spectroscopy. The measurements below 600 GHz (CD: $N=1\rightarrow1$ and $^{13}$CH: $N=1\rightarrow1$) were carried out at Arizona, while those in the 900 GHz range were conducted at JPL (CD: $N=1\rightarrow1$). The two radical species were created in an electrical discharge of either $^{13}$CH$_4$ or CD$_4$. Both lambda-doubling and hyperfine splitttings were resolved in the spectra. The data were analyzed with a case(b) effective Hamiltonian, resulting in an improvement in the lambda-doubling and deuterium, proton, and $^{13}$C hyperfine constants. Highly accurate rest frequencies are now available for astronomical searches for these species. CH is an abundant and widespread interstellar molecule, and thus CD and $^{13}$CH should be of astrophysical interest. Description: Author Institution: University of Arizona, Steward Observatory, Department of Chemistry Arizona Radio Observatory, Tucson, AZ 85721; Jet Propulsion Laboratory, Pasadena, CA 91109 URI: http://hdl.handle.net/1811/33495 Other Identifiers: 2008-RB-11