Abstract
The pure rotational spectrum of calcium monomethyl, CaCH3(X 2A1), was recorded using the pump/probe microwave-optical double resonance (PPMODR) technique. The determined Fermi contact and dipolar parameters are: aF=−1.965(11) and Taa=2.180(18) MHz. The spin-rotation parameters are: eaa=6.702(49) and (ebb+ecc)/2=55.5730(27) MHz. The mm-wave data [M. A. Anderson and L. M. Ziurys, Astrophys. J. 460, L77 (1996)] were reanalyzed to produce a set of fine structure parameters that are consistent with the PPMODR values and for which the standard deviation of the mm-wave data set is greatly reduced. A global fit of the two sets of data was performed to give an improved set of fine and hyperfine parameters for the X 2A1 state. The negative value for aF is inconsistent with a simple σ-bond spin polarization model. A comparison among calcium containing molecules is made using hyperfine and spin-rotation parameters.
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