Glow Discharge Electron Impact Ionization (GDEI)

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

GDEI

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

GDEI

Effect of pulsed manifold pressure change on glow discharge current

 

Reference

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