Abstract
We describe an electron monochromator using hemispherical deflecting electrodes and its application to the measurement of electron excitation functions. We present excitation functions of the 4 1 S and 4 3 S states of helium for energies within about 1 V of threshold. We find a prominent peak in each function and determine its energy as 4 1 S 23.937 ± 0.007 ± 0.011 eV, 4 3 S 23.939 ± 0.007 ± 0.009 eV, where the first limits represent a systematic error and the second are standard deviations of several determinations.
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Schedule a callMore From: Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences
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