The algebraic variational method has been applied to the scattering of electrons by hydrogen atoms at intermediate energies. The atom was represented by an eleven-state expansion, including exact $1s$, $2s$, $2p$, and $3d$ states plus seven pseudostates. The pseudochannels are allowed to be open. Results are presented for $1s-2s$ and $1s-2p$ excitations for energies between 10 and 12 eV, and for $1s-1s$ elastic scattering from 10 to 30 eV.

• Received 27 November 1973

DOI:https://doi.org/10.1103/PhysRevA.9.1924