For the first time theoretical predictions for (e, 2e) on a hydrogen m
inus, H-, target are presented. This study shows that the size and sha
pe of the TDCS for this process is extremely sensitive to the form of
the approximation used for the H- wavefunction. in particular, the TDC
S is enormously model sensitive in the Bethe ridge region (when the re
coil ion momentum is zero).