Electron beam formation in an open discharge: Part 2. Does the photoelectron mechanism work?

The qualitative pattern of electron beam formation in discharges of various types, including hollow-anode, anomalous, and open, is considered from the most general standpoints. The considerations confirm the conclusion made by the author previously: atom-induced electron emission ensures a high efficiency of the electron beam formation, provided that sufficiently fast atoms are formed in the recharge process, which is consistent with commonly accepted notions about the glow discharge. Examples of the general character are presented which indicate that the open discharge is incompatible with the photoelectron mechanism, although publications in favor of the latter model still appear. The latest of such publications is critically analyzed.