Knowledge Bank

The microwave spectrum of the CCP and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CP radicals (X$\mathrm{<mrow\; data-mjx-texclass="ORD">2</mrow>}\Pi r$) has been measured using Fourier Transform techniques. These species were created by the reaction of a mixture of PCl$3$ vapor and acetylene diulted in argon carrier gas and a DC glow discharge. Two rotational transitions each were measured in the frequency range of 18 to 32 GHz. The lambda-doublets of the $\Omega$ = 1/2 component of CCP and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CP were each split by phosphorus hyperfine interactions. For $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CP, additional hyperfine splittings were observed due to both $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C atoms, creating several doublets of doublets. These data were analyzed with a Hamiltonian incorporating three nuclear spins. The data were combined with millimeter/submillimeter measurements for CCP and $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$C$\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}$CP, and fit with a case (c) Hamiltonian, and effective rotational, lambda-doubling, and phosphorus and carbon-13 hyperfine constants were determined.