Discharge ionization detector having efficient transfer of metas

Details Discharge ionization detector having efficient transfer of metas Discharge ionization detector having efficient transfer of metas

1997-08-29

1999-03-30

Do, Diep N.

Electricity: measuring and testing

Using ionization effects

For analysis of gas, vapor, or particles of matter

324 711, 324465, 73 2802, 250423R, G01N 2762

Patent

active

058894047

ABSTRACT:
In a discharge ionization detector, a method and apparatus are disclosed for increasing the transfer of photons and metastables from a discharge chamber to a ionization chamber, while effecting ion discrimination of the ionic current with respect to a signal cathode, thereby reducing the effect of ionic current in the signal output. Preferred embodiments of the invention include a discharge source located in a discharge chamber, means for introducing discharge gas flow into the discharge chamber, a flow guide that directs discharge gas flow between the discharge chamber and an adjacent ionization chamber, and inlet port for introducing a flow of sample gas containing an analyte into the ionization chamber and an outlet port for exhausting the sample gas and the discharge gas. A plurality of apertures in the flow guide are situated proximate the discharge source so as to promote the rapid and efficient transfer of photons and metastables from the discharge source into the ionization chamber. A signal cathode and the ionization chamber are biased in a circuit with an electrometer so as to provide a detector output signal.

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G. Gremaud, W.E. Wentworth, A. Zlatkis, R. Swatloski, E.C.M. Chen, S. Stearns, "Windowless Pulsed-Discharge Photoionization Detector Application To Qualitative Analysis Of Volatile Organic Compounds", accepted Aug. 18, 1995, Journal of Chromatography A. 724 (1996) pp. 235-250.

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