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The jet cooled, laser-induced fluorescence spectra of the $A~2E-X~2A1$ transition in $ZnCH3$ and $CdCH3$ have been previously reported by this $laboratory.1$ These organometallic radicals were formed by photolysis of the metal dimethyl compound, $M(CH3$), where $M=Zn$, Cd. The focus of the initial report involved the vibronic and spin-orbit structures in the electronic spectra of $ZnCH3$ and $CdCH3$. We new report an analysis of the rotationally resolved spectra of the origin band for each of these radicals. A spectroscopic study of the inert-gas molecular Van der Waals complex, $He-CdCH3$, was included in that first $report.1$ The rotationally resolved spectrum of this complex has been recorded and will be discussed.