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The investigation of electron beam ionization as a replacement for corona-wire ionization in electrostatic precipitators is motivated by the results of preliminary experiments. Large ion current densities, almost three orders of magnitude higher than are commonly found in conventional electrostatic precipitators, are available for particle charging. The various electron beam ionization regimes present in a precipitator-like parallel electrode system have been measured and analyzed. An electron beam precharger has been constructed to test the utilization of large ion current densities and an applied electric field to achieve monopolar charging of aerosols. The recently completed electron beam precharger test facility (EBPTF) at Florida State University incorporates a fully instrumented electrostatic precipitator (collector); comprehensive gas, particle, and charge monitors; and a microcomputer-based data acquisition and analysis system. Experiments utilizing a wide variety of aerosols are underway to determine particle charging and collection efficiencies. Modifications to the EBPTF are possible for the investigation of the combined removal of SO2, NOx, and particles.