  We discuss selectron pair production in e- e- scattering. These processes can
only occur via t-channel neutralino exchange, provided that the neutralinos are
Majorana fermions. We concentrate on the processes e- e- -> e^~_L e^~_L,e^~_R
e^~_R -> e- X^~_1^0 e- X^~_2^0 -> e- X^~_1^0 e- X^~_1^0 f f, in which a
complete determination of the final state momenta is possible without using the
selectron masses as input. The experimental reconstruction of the selectron
masses in this decay channel provides clear evidence of the Majorana character
of the neutralinos, which is confirmed by the analysis of the electron energy
spectrum.
