DOUBLE IONISATION OF H^- BY FAST ELECTRON IMPACT C.SINHA THEORETICAL PHYSICS DEPARTMENT, INDIAN ASSOCIATION FOR THE CULTIVATION OF SCIENCE, JADAVPUR,CALCUTTA-32, INDIA e-mail:tpcs@mahendra.iacs.res.in Double ionisation (e,3e) of H^- is studied theoretically by using correlated wavefunction for the target and a partially correlated double continuum in the final channel. The long range Coulomb attraction between the projectile and the target has been taken into account properly in both the channels. 5DCS have been calculated for both symmetric and asummetric geometries.