POLARIZATION OF BALMER-a RADIATION FOLLOWING ELECTRON IMPACT ON ATOMIC HYDROGEN. W.Kedzierski and J.W.McConkey School of Physical Sciences, University of Windsor, Ontario N9B 3P4, Canada. A pulsed microwave source has enabled a high density atomic hydrogen target to be obtained without the complication of a high background visible light intensity from the source when measurements of the interaction of an electron beam with the target are being carried out. Excitation and polarization function measurements of H (Balmer-a) have been made from threshold to 200 eV and have been compared with recent CCC calculations.