Center-of-mass translational energy distributions of the dominant primary products resulting from 193.3 nm excitation of jet-cooled CH3OH, CH3OD, and CD3OH were obtained by using the high-n Rydberg time-of-flight (HRTOF) technique. The appearance threshold in the HRTOF spectrum yields a bond dissociation energy, D-0(CH3O-H), of 105+/-1 kca mol(-1), in agreement with recent literature values. Translational energy release spectra from the three isotopomers exhibit progressions of 950+/-100 cm(-1), which are attributed to excitation in the upsilon(3) O-CH3 stretch of the methoxy product. The progressions peak at upsilon=1, with population out to at least upsilon=5. This differs from the results of a recent wave packet dynamics study on a calculated excited state potential energy surface [Marston et al., J. Chem. Phys. 98, 4718 (1993)], which predicted no O-CH3 stretch excitation in the methoxy fragment following photolysis of ground state methanol. The spatial anisotropy of the fragments (beta similar to-0.7) implies a dissociation time less than or equal to 1 ps. The impulsive model for rotational excitation is compared to the unresolved rotational contour of-the vibrational peaks in the translational energy release spectra and is found to underestimate the extent of rotational excitation, though the model correctly predicts the increase in contour width observed for the O-deuterated species. The unresolved rotational contours are fit empirically. The inferred vibrational energy distributions are discussed in terms of a simple Franck-Condon model for the pseudotriatomic, Me-O-H. Implications of the vibrational and rotational photofragment distributions for the full 1 (1)A" surface are discussed.