Abstract
The threshold photoelectron-coincidence photoion mass spectrometer is a powerful tool for the study of state-selected ions. Threshold photoelectron detectors used in this apparatus transmit small but significant numbers of electrons at energies up to two orders of magnitude higher than the energy resolution of this detector. It is frequently important to know the fraction of the total coincidence count which results from non-threshold electrons, and to correct for them. This requires measurement of the transmission characteristics of the threshold photoelectron detector over a wide range of energies. We have developed a simple experimental method for checking the transmission performance of such a detector, as well as a mathematical formalism for calculating the transmission function in closed form.
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