SPIN AND ORBITAL ANGULAR MOMENTUM EFFECTS IN THE (e,2e) IONIZATION OF SODIUM A. Elliott*, J. Lower and E. Weigold Research School of Physical Sciences and Engineering, IAS, The Australian National University, Canberra, ACT 0200, Australia *Dept. of Physics and Astronomy, The University of Oklahoma, 440 West Brooks, Norman OK, USA 73019-0225 We present (e,2e) cross sections for the ionization of spin-polarized ground and excited state sodium atoms by spin- polarized electrons. Laser pumping of the sodium atoms prior to ionization is used to prepare them in a specific angular momentum magnetic substate. Measuring cross sections under such conditions, where the projection quantum numbers of the initial state are determined, elucidates the roles of spin and orbital angular momentum in the ionization process.