Intense source of spin‐polarized electrons
作者:
L. A. Hodge,
F. B. Dunning,
G. K. Walters,
期刊:
Review of Scientific Instruments
(AIP Available online 1979)
卷期:
Volume 50,
issue 1
页码: 1-4
ISSN:0034-6748
年代: 1979
DOI:10.1063/1.1135659
出版商: AIP
数据来源: AIP
摘要:
Spin angular momentum conservation in chemiionization reactions involving optically oriented He(23S) atoms in a flowing helium afterglow has been exploited to yield a source of spin‐polarized electrons. Either transversely or longitudinally polarized electrons can be extracted. Polarized electron beam currents of ∼2 &mgr;A have been realized at 40% polarization. The beam has an effective emittance of ∼2 mrad/cm over the energy range 100–400 eV, an energy spread of ≲0.15 eV, and the polarization is readily reversible. The source is relatively inexpensive and appears suitable for the majority of low‐energy spin‐dependent scattering experiments proposed to date.
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