High Resolution Studies of Electron Excitation. I. The 4S States of Helium and the Energy Scale

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 41S and 43S states of helium for energies within about 1 V of threshold. We find a prominent peak in each fu...

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Veröffentlicht in:Proceedings of the Royal Society of London. Series A, Mathematical and physical sciences Mathematical and physical sciences, 1973-07, Vol.334 (1596), p.135-147
Hauptverfasser: Heddle, D. W. O., Keesing, R. G. W., Kurepa, Jelena M.
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Sprache:eng
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Zusammenfassung: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 41S and 43S states of helium for energies within about 1 V of threshold. We find a prominent peak in each function and determine its energy as 41S 23.937 ± 0.007 ± 0.011 eV, 43S 23.939 ± 0.007 ± 0.009 eV, where the first limits represent a systematic error and the second are standard deviations of several determinations.
ISSN:1364-5021
0080-4630
1471-2946
2053-9169
DOI:10.1098/rspa.1973.0084