  Treating Coulomb scattering of two free electrons in a stationary approach,
we explore the momentum and spin entanglement created by the interaction. We
show that a particular discretisation provides an estimate of the von Neumann
entropy of the one-electron reduced density matrix from the experimentally
accessible Shannon entropy. For spinless distinguishable electrons the entropy
is sizeable at low energies, indicating strong momentum entanglement, and drops
to almost zero at energies of the order of 10 keV when the azimutal degree of
freedom is integrated out, i.e. practically no entanglement and almost pure
one-electron states. If spin is taken into account, the entropy for electrons
with antiparallel spins should be larger than in the parallel-spin case, since
it embodies both momentum and spin entanglement. Surprisingly, this difference,
as well as the deviation from the spin-less case, is extremely small for the
complete scattering state. Strong spin entanglement can however be obtained by
post-selecting states at scattering angle pi/2.
