Absolute fully resolved (e,3e) cross sections for the double ionization ofhelium

We have measured for the first time full sets of coplanar (e,3e) angular di stributions for double ionization of He, at an impact energy of similar to 5 and similar to 1 keV. Ejected electrons are detected with equal energies, 10 and 4 eV. Comparison is made with analog (gamma,2e) results, and deviat ions from the dipolar limit are pointed our. The data are also compared wit h two calculations, using either a four-body final-state wavefunction for t he three electrons moving in the field of He2+, or the convergent close cou pling method.