Electron affinity spectroscopy by high frequency excitation of the pulse-sampled electron capture detector



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The pulse-sampled electron capture detector has been shown to combine extreme sensitivity with reliability for the quantitative determination of trace components separated by gas chromatography. By varying the kinetic energy of the electron population in the detector through the application of a high frequency alternating potential, this device can also be made to perform the functions of a qualitative instrument. Electron affinity spectra characteristic of a number of compounds known to undergo either or both dissociative and nondissociative electron attachment are presented and are in agreement with the observations of other investigators using instruments which are of far greater complexity or which are basically incompatible with gas chromatographic technique. In addition high-frequency excitation provides a means of increasing the sensitivity of detection of certain classes of compounds while retaining the advantages of the pulse-sampling technique.