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15.—On a Source of Polarised Electrons*

Published online by Cambridge University Press:  14 February 2012

D. M. Campbell ,
H. M. Brash  and
P. S. Farago
D. M. Campbell
Affiliation:
Department of Physics, University of Edinburgh
H. M. Brash
Affiliation:
Department of Physics, University of Edinburgh
P. S. Farago
Affiliation:
Department of Physics, University of Edinburgh
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Synopsis

A prototype source of polarised electrons is described, in which electrons trapped by a combination of electric and magnetic fields are polarised through spin exchange interaction with a polarised beam of potassium atoms. Under typical operating conditions, a pulsed electron beam was extracted with 104 electrons per pulse and a polarisation of 0·45 at a repetition rate of 50 S−1. The scope for improvement of these figures is briefly discussed.

Values for the total spin exchange collision cross-section at electron energies of 1 eV, 2·5 eV and 4 eV were obtained. These are in reasonable agreement with theoretical predictions.

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 70 , 1972 , pp. 165 - 180
Copyright
Copyright © Royal Society of Edinburgh 1972

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References

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