Phys. Rev. A 68, 052715 (2003) [6 pages]Time-dependent coupled-channel calculation for elastic scattering of positrons by hydrogen atoms and helium ionsReceived 3 September 2003; published 24 November 2003 We investigate elastic scattering of positrons by hydrogen atoms and helium ions using a time-dependent coupled-channel (TDCC) method. Phase shifts are calculated with the time-energy Fourier transform of a wave packet. Numerical accuracy of the TDCC method is demonstrated for S-, P-, and D-wave scatterings by hydrogen atoms. For helium ions, we examine the low-lying S-wave resonances with a broad width recently predicted in variational eigenenergy calculations. However, resonancelike behaviors are not discernible in the S-wave phase shift for the ground-state target. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.68.052715
DOI:
10.1103/PhysRevA.68.052715
PACS:
34.85.+x
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