A pseudostate multichannel eikonal study of e-H(1s) inelastic collisions

The effect of including the 3s and 3p pseudostates is examined for the 2s and 2p excitation of atomic hydrogen by incident electrons with energy E (eV) in the range 16.5<or=E<or=200. The 2s excitation is most strongly affected and displays a behaviour consistent with measurement and refined theories which include polarizations. The 2p excitation agrees particularly well with the full quantal pseudostate treatment and with experiment. A seven-channel (1s,2s,2p,3s,3p) treatment is also performed, and the resulting 2s and 2p cross sections lie closer to those of the pseudostate description than to the four-channel (1s,2s,1p) results as expected.