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dc.creatorHalfen, D. T.en_US
dc.creatorClouthier, D. J.en_US
dc.creatorZiurys, L. M.en_US
dc.date.accessioned2008-07-15T13:38:50Z
dc.date.available2008-07-15T13:38:50Z
dc.date.issued2008en_US
dc.identifier2008-FC-02en_US
dc.identifier.urihttp://hdl.handle.net/1811/33365
dc.descriptionAuthor Institution: Steward Observatory, University of Arizona, Tucson, AZ, 85721; Department of Chemistry, University of Kentucky, Lexington, KY, 40506; Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, Tucson, AZ, 85721en_US
dc.description.abstractThe pure rotational spectrum of the CCP radical (X$^{2}\Pi_{r}$) has been measured using millimeter-wave direct absorption techniques. This work is the first high-resolution data for this radical. This species was created by the reaction of gas-phase phosphorus and acetylene in the presence of argon carrier gas and an AC glow discharge. Twenty-four rotational transitions were measured in the frequency range of 120 to 413 GHz. Each transition is separated into two spin-orbit components; however, only the $\Omega$ = 1/2 component has been observed to date. This spin component is additionally split into lambda-doublets. Below 209 GHz, hyperfine interactions due to the phosphorus nuclear spin of I = 1/2 are evident, spitting each lambda-doublet into two lines. The data were fit with a case (c) Hamiltonian, and effective rotational, lambda-doubling, and phosphorus hyperfine constants were determined. Additional searches are being conducted for the $\Omega$ = 3/2 component. These data prove that CCP has a linear geometry in its ground state. This structure is similar to other MC$_2$ species, such as CCS and CCCl, in contrast to NaC$_2$, MgC$_2$, AlC$_2$, and SiC$_2$. The change in structure from T-shaped to linear is caused by a increase in the covalent bonding interactions between the C$_2$ moiety and the heteroatom.en_US
dc.language.isoEnglishen_US
dc.publisherOhio State Universityen_US
dc.titleMILLIMETER/SUBMILLIMETER SPECTRUM OF THE CCP (X$^{2}\Pi_{r}$) RADICALen_US
dc.typeArticleen_US


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