A theoretical calculation of the laser-induced fluorescence excitation spectrum from X∼2E→A∼2A1 is carried out for CH 3 O and CD 3 O using a transition dipole moment surface expanded up to second order. The vibronic form of these operators is obtained using symmetry arguments. The A∼2A1 vibrational levels are calculated using Van Vleck perturbation theory, and the latter is used to adjust harmonic constants of the potential to match experimental fundamentals. The CH 3 O fit force field is tested on CD 3 O. For both molecules the transition energies are well reproduced, but there are systematic differences between experimental and theoretical intensities. The origins of these differences are discussed.