The Millimeter and Submillimeter Rotational Spectrum of CaCH[TINF]3[/TINF]([FORMULA][F][A][AC]X[/AC][AC][d5][/AC][/A][/F][/FORMULA] [TSUP]2[/TSUP][ITAL]A[/ITAL][TINF]1[/TINF])

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Abstract
The pure rotational spectrum of the calcium monomethyl radical, CaCH3( 2A1), has been measured in the laboratory using millimeter/submillimeter direct absorption techniques. CaCH3 was produced by the reaction of calcium vapor and an organometallic methyl compound. Seventeen rotational transitions in the frequency range 136-377 GHz were recorded for this free radical, which is a symmetric top species with one unpaired electron. In every transition, several K-components were observed, as well as fine-structure splittings. The data were analyzed using a2A1 Hamiltonian, and rotational and spin-rotation parameters were determined. These high-resolution measurements for CaCH3 will now enable a search for this molecule in the interstellar medium.
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