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A differential retarding potential method for the study of the energy distribution of slow electron emissions

Published online by Cambridge University Press:  24 October 2008

C. F. Sharman
C. F. Sharman
Affiliation:
King's College
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Extract

The method described gives the differential energy distribution curve directly from readings of a galvanometer and a voltmeter. When adjusted, the arrangement is convenient in operation and very good “resolution” can be obtained. The existence of a maximum frequency of secondary electrons at a finite small energy has been established, and its position is shown to be independent of the energy of the primary beam over a fairly wide range. The effect of deposition of tungsten on a clean copper surface is studied with respect to the secondary emission properties of the surface. From these experiments some interesting conclusions concerning the mechanism of the process may be drawn.

I am very grateful to Prof. Sir Ernest Rutherford for the encouragement he has given and the interest he has taken in this work.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 23 , Issue 8 , October 1927 , pp. 922 - 929
Copyright
Copyright © Cambridge Philosophical Society 1927

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References

* Camb. Phil. Soc. Proc. XXIII, Pt. 5 (1927), p. 523.Google Scholar

* The actual magnitudes of r and R are governed in practice by the relations

where Ȓ is the resistance for critical damping of the galvanometer.

† Becker, . Ann. der Physik, LXXVIII (1925), p. 209.CrossRefGoogle Scholar

* Becker, , Ann. der Physik LXXV (1924), p. 217.CrossRefGoogle Scholar

† Campbell, , Phil. Mag. XXIII (1914), p. 46.Google Scholar

‡ Petry, , Phys. Rev. 1925, p. 346;CrossRefGoogle ScholarFarnsworth, , Phys. Rev. XXVI (1925), p. 41;CrossRefGoogle ScholarBarber, , Phys. Rev. 1921, p. 322.CrossRefGoogle Scholar

* The sharpness of these images showed that the vacuum conditions inside the experimental tube were adequate.