Abstract
A specially designed retarding field analyzer has been set in the front of a quadrupole mass filter for studying the energy distribution of thermal ion emitted from a hot metal surface. The distribution curve is obtained by the technique of electrical differentiation of the retarding plot in which a small modulating voltage is applied to the two retarding grids in a method similar to Auger electron spectroscopy with a four-grid low-energy electron diffraction system. The technique has been applied to study the energy distribution curve of K+ thermal ion emitted from a tungsten ribbon. The curve is Maxwellian in full region of retarding field. The value of retarding potential at maximum peak corresponds to the contact potential difference between the ribbon emitter and the retarding grid.
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