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Pulsed discharge ionization detector
A pulsed discharge ionization detector (pulsed discharge detector) is a detector for gas chromatography that utilizes a stable, low powered, pulsed DC discharge in helium as an ionization source.
〔W. E. Wentworth ''et al.'', "Pulsed Discharge Helium Ionization Detector ", Chromatographia, Volume 34, September/October 1992, Numbers 5-8, Pages 219-225〕〔W. E. Wentworth ''et al.'', "Pulsed Discharge Helium Ionization Detector - Universal Detector for Inorganic and Organic Compounds at the Low Picogram Level ", ''Journal of Chromatography A'', Volume 688, Issues 1-2, 30 December 1994, Pages 135-152〕〔D. S. Forsyth, "Pulsed Discharge Detector: Theory and Applications", ''Journal of Chromatography A'', Volume 1050, Issue 1, 24 September 2004, Pages 63–68〕
Eluants from the GC column, flowing counter to the flow of helium from the discharge zone, are ionized by photons from the helium discharge. Bias electrode(s) focus the resulting electrons toward the collector electrode, where they cause changes in the standing current which are quantified as the detector output.
==Electron capture mode==
In the electron capture mode, the PDD is a selective detector for monitoring high electron affinity compounds such as freons, chlorinated pesticides, and other halogen compounds. For this type of compound, the minimum detectable quantity (MDQ) is at the femtogram (10-15) or picogram (10-12) level. The PDD is similar in sensitivity and response characteristics to a conventional radioactive ECD, and can be operated at temperatures up to 400°C. For operation in this mode, He and CH4 are introduced just upstream from the column exit.
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