The pump-probe technique has been employed to study the photodissociation processes of sulfur dioxide (SO2). The SO2+ transient has been fit to a biexponential with decay times of 230 +/- 9 fs and 8 +/- 4 ps. The growth of (SO+)-S-32 was determined to be 225 +/- 10 fs with a decay of 373 +/- 27 fs. The response of the isotope (SO2+)-S-34 was also fit to a biexponential decay with lifetimes of 195 +/- 14 fs and 4 +/- 1 ps. The decay of (SO+)-S-34 was fit to 381 +/- 30 fs. The results display that an inverse kinetic isotope effect is operative during dissociation of SO2 through the (E) over tilde state.