Glow Discharge Electron Impact Ionization (GDEI)


Advantages compare to filament:   

  • Resistive to high pressure
  • Low power consumption: < 0.1 W
  • Life time: indefinite
  • Maintenance time: hundreds of hours
  • Multifunction: used as both electron source and pressure gauge


Glow discharge current and manifold pressure recorded over a period of 120 h


Effect of pulsed manifold pressure change on glow discharge current



Liang Gao, Qingyu Song, Robert J. Noll, Jason Duncan, R. Graham Cooks and Zheng Ouyang, "Glow Discharge Electron Impact Ionization Source for Miniature Mass Spectrometers" , Journal of Mass Spectrometry , 2007 , 42, 5, 675-680, doi: 10.1002/jms.1201