Impact parameter dependence of heavy ion e+e- pair production to all orders in Zα

The heavy ion probability for continuum e(+)e(-) pair production has been calculated to all orders in Z alpha as a function of impact parameter. The formula resulting from an exact solution of the semiclassical Dirac equation in the ultrarelativistic limit is evaluated numerically. In a calculation of gamma=100 colliding Au ions, the probability of e(+)e(-) pair production is reduced from the perturbation theory result throughout the impact parameter range.