Abstract
A report on detailed tests with the HPD (thermionic detector', tandem FID) has been published by Jentzsch and collaborators [ 1]. Reference is made again to the literature cited in the above report, as a possible source of ideas for clarification of the probable operating principle of this detector. The arrangement used consists of a hollow cylinder, mounted above an FID, for operation in conjunction with the latter. This cylinder is provided with a gas inlet for an additional hydrogen flame and a mount for the electrode delivering the HP signal. A small, coiled platinum capillary, frilled with alkali, is mounted on the flame jet. The Pt lattice expands during the heating process, so that alkali ions diffuse to the surface of the cot. Under the influence of a mechanism which has not as yet been clarified, the alkali ions are detached from the surface and collected to form the signal current. The amount of alkali ions yielded depends on the amount of F, CI, Br, I or P elements present in the combustion products of the pre--connected FID. The signal is accordingly proportional to a halogenstimulated alkali emission.
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