Citation
Watanabe, Kenichi (1940) Resonance Broadening of the Sodium D-Lines in Absorption. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/tzfa-n362. https://resolver.caltech.edu/CaltechTHESIS:02142025-214936682
Abstract
The resonance broadening of the sodium D-lines in absorption was determined by measuring the contour of the line wings directly. The vapor pressures of sodium ranged from 10-3 to 75 mm Hg, with negligible amount of foreign gases. Over nearly the entire range, the half-intensity width varied linearly with the density of the absorbing atoms; i.e. Δν1/2/N = 0.78 x 10-7 sec-1cm3 --the constant being about twice that predicted by Houston, but much less than the experimental result by Hughes and LLoyd. Above 5 mm pressure, the half-intensity width appeared to increase slightly faster than N. Somewhat in contradiction to theory, the relative width, Δν1/2,s/Δν1/2,1' was 1.16. The natural width measured was, within experimental error, consistent with previous values. The inverse square contour for the absorption coefficient was satisfactory up to 5 mm Hg; beyond this pressure an inverse cube contour fitted better. No definite evidence of van der Waal force was observed at high pressures; likewise, no appreciable shifts and asymmetries. MgO windows were used and the temperature determination was made reliable.
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 1940 |
Record Number: | CaltechTHESIS:02142025-214936682 |
Persistent URL: | https://resolver.caltech.edu/CaltechTHESIS:02142025-214936682 |
DOI: | 10.7907/tzfa-n362 |
Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
ID Code: | 17004 |
Collection: | CaltechTHESIS |
Deposited By: | Benjamin Perez |
Deposited On: | 21 Feb 2025 22:47 |
Last Modified: | 21 Feb 2025 22:47 |
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