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A Determination of e/m from the Zeeman Effect

Citation

Campbell, John Stuart (1931) A Determination of e/m from the Zeeman Effect. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/5s2m-6b11. https://resolver.caltech.edu/CaltechTHESIS:08272024-180405314

Abstract

Values of e/m have been obtained from the Zeeman separations of the Cd line λ 6439 and the Zn line λ 6362, the g-factors of which have been carefully examined. Magnetic fields up to 7300 gauss are produced in a solenoid giving less than .1% variation in field strength over a length of 6 cm at the center. The current-field ratio K of the solenoid is determined, under operating conditions, in terms of the calculated ratios of measured single layer solenoids. The field strength. during exposure is given by the product of K and the solenoid current. Evaporation of Zn and Cd in the short (6 cm) positive column of a helium discharge gives the desired lines, the Zeeman patterns of which are photographed with a Fabry-Perot interferometer. Measurement of the separations at orders of interference in the neighborhood of 100,000 gives the following values:

Cd λ 6439 : e/m = 1.7578 x 107 e m units ± .06%

Zn λ 6362 : e/m = 1.7576 ± .05%

These results are stated as

e/m = (1.7577 ± .0017) x 107 abs e m units

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Houston, William Vermillion
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1931
Record Number:CaltechTHESIS:08272024-180405314
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:08272024-180405314
DOI:10.7907/5s2m-6b11
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16675
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:29 Aug 2024 21:34
Last Modified:29 Aug 2024 21:35

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