Electron-hydrogen P-wave elastic scattering -: art. no. 032714

In previous papers [ A. K. Bhatia and A. Temkin, Phys. Rev. A64, 032709 (2001) ; A. K. Bhatia, Phys. Rev. Aibid. 66, 064702 (2002) ], electron-hydrogen and electron- He+ S-wave scattering phase shifts were calculated using the optical potential approach. This method is now extended to the singlet and triplet electron-hydrogen P-wave scattering in the elastic region. Phase shifts are calculated using Hylleraas-type correlation functions with up to 220 terms. Results are rigorous lower bounds to the exact phase shifts and they are compared to phase shifts obtained from previous calculations.