Spectroscopic diagnostics of microhollow gas discharge in hydrogen

摘要

Hydrogen Balmer beta line profile from a microhollow gas discharge (MHGD) in hydrogen is used for diagnostics of cathode sheath (CS) parameters. The profile was recorded from a MHGD microhole (diameter 100 μm at narrow and 130 /an at wider side) of a gold-alumina-gold sandwich in the pressure range (100-400) mbars. The average electric field strength in CS (25-46) kV/cm and CS thickness (60-120) μm were determined by profile fitting with the aid of model recently developed and used in argon MHGD.