Abstract
A new method of producing high density positive charge carriers in liquid He II was developed by using an immersed hot tungsten filament. The production mechanism and transport properties of the positive carriers were investigated both experimentally and theoretically. It was found that when the applied voltage is reversed in the hot cathode diode an electrical discharge occurs in the gas sheath around the filament and the positive ions are emitted from the discharge plasma into surrounding liquid He II. The estimated carrier density is about 10 10 carriers/cc.
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