Boundary conditions for the Pauli equation: Application to photodetachmentof Cs- - art. no. 123003

We formulate boundary conditions near the atomic nucleus for solving the Pa uli equation, based on the analytic solution of the Dirac equation: for a C oulomb potential. We then integrate the Pauli equation using an effective p otential that is adjusted to reproduce Dirac R-matrix scattering phase shif ts, and find the P-3(1)o resonance contribution to the photodetachment cros s section of Cs-. Our photodetachment cross sections agree with recent expe riments by Scheer et al. [Phys. Rev. Lett. 80, 684 (1998)] after tuning the resonance position by 2.4 meV. We also provide angle-differential photodet achment cross sections and the corresponding asymmetry parameter beta near the Cs(6s) threshold.