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.)) |
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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): |
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Thesis Committee: |
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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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