The absorption cross sections of dimethylzinc, dimethylcadmium, and dimethylmercury are measured from 3000 to 1750 Aring; using a computerized spectrometer with 0.6 Aring; resolution. Structured continua with long progressions of vibrational peaks are observed for all three molecules. This vibrational structure, which is explained by a direct, asymmetric dissociation process resulting in a methyl radical and a metalndash;monomethyl molecule, is identified with vibrational modes in the fragments. A discussion of the electronic states of metalndash;alkyl molecules is given.
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