Electron configuration mixing and parity nonconservation in atomic Bi

Configuration mixing is investigated in a relativistic theory for states in Bi which dominate the effects of weak parity nonconservation. The corrections to the parity-nonconserving electric dipole and parity-conserving magnetic dipole transition matrix elements between the lowest two states are computed and found to be less than 4%. Such effects do not remove the discrepancy between atomic experiments and the Weinberg-Salam theory.