An experiment to distinguish between homogeneous and heterogeneous response mechanisms in a parallel-plate electron-capture detector
Journal of Chromatography A
A 63Ni parallel-plate electron-capture detector was run under two disparate conditions: one as closely as possible resembling a homogeneous plasma ("stirred reactor"), the other resembling a typically heterogeneous plasma ("space charge") system. The latter produced a response almost two orders of magnitude larger than the former, both under d.c. and pulse regimes, and its linear range was more than one decade longer. Enhancing homogeneity by using two radioactive foils, i.e. by making both the cathode and the anode radioactive, diminished the response of the former but heightened the response of the latter system. This is consistent with the idea that (at least) two mechanisms are operating. It is apparent that, under conditions prevailing in most conventional parallel-plate electron-capture detectors, response arises predominantly from space charge mechanisms. © 1987.
Siu, K.W. Michael and Aue, W.A.. (1987). An experiment to distinguish between homogeneous and heterogeneous response mechanisms in a parallel-plate electron-capture detector. Journal of Chromatography A, 406 (C), 81-93.