Abstract
An optically pumped flowing helium afterglow is evaluated as a potential source of polarized electrons. Spin angular momentum conservation in chemi-ionization reactions involving optically oriented $\mathrm{He}(2^{3}S)$ atoms has been exploited to yield microampere electron beams with 30% polarization and energy spread \ensuremath{\le} 0.5 eV. The beam emittance is on the order of 10 mrad cm at 500 V extraction potential. This source appears well-suited for most spin-dependent scattering experiments that have been proposed.
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