We report on (e, 2e) experiments for excitation-ionization of helium made i
n asymmetric geometry at intermediate incident energy and low momentum tran
sfer. The results are compared with Born 1 calculations. Some degree of agr
eement is obtained and seems to be improved by correction for post-collisio
n interactions. But it cannot be expected that such simple models will corr
ectly reproduce processes that depend so strongly on correlations.