Note on Secondary Electrons in the Negative Glow and Faraday Dark Space†

Abstract

Measurements have been made of the energy distributions of secondary electrons in the negative glow and Faraday dark space in helium, neon and air, using the double differential method with an unscreened and, in a few instances, a screened probe. The results are consistent with the supposition that the secondary electrons are produced in the negative glow and neigh-bouring parts of the cathode dark space (cathode rays), and that the secondary electrons diffuse into the Faraday dark space, with small elastic energy leases in noon and larger inelastic energy losses in air.