- Access by Xinjiang University
Distinction between Contact-Potential Effects and True Reflection Coefficients for Low-Velocity Electrons
Phys. Rev. 36, 1190 – Published 1 October, 1930
DOI: https://doi.org/10.1103/PhysRev.36.1190
Abstract
A method is described for determining the apparent electron reflection coefficient in two ways in the same apparatus such that a distinction may be made between a contact potential and a true reflection coefficient for very low-velocity electrons. The results indicate that for a copper target which has been heated at red heat for some time in a high vacuum, the true electron reflection coefficient approaches a zero value as the primary voltage approaches zero, and that the apparent increase in the reflection coefficient below about one volt, is due to a change in the contact potential between the target and the surrounding electrodes. The value of this change for the specimen tested is approximately 1.2 volts.
References (4)
- H. E. Farnsworth, Phys. Rev. 20, 358 (1922)
- L. Nordheim, Zeits. f. Physik 46, 833 (1928) Proc. Roy. Soc. A121, 626 (1928)
- H. E. Farnsworth, Phys. Rev. 34, 679 (1929)
- H. E. Farnsworth, J.O.S.A. & R.S.I. 15, 290 (1927)