The unimolecular metastable dissociation of trimethylsilyl acetate, CH3COOSi (CH3) 3 (1), and its fluorine analogue, trimethylsilyl trifluoroacetate, CF3COOSi (CH3) 3 (2), upon electron impact have been investigated by means of a B/E linked scan, high resolution data, and D-labeling. The results are compared with those of the carbon analogue, tert-butyl acetate, CH3COOC (CH3) 3 (3). No molecular ion of any of these compounds can be ...