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An Atomic Beam Method for Measuring Absolute f-Values


Davis, Milford Hall (1955) An Atomic Beam Method for Measuring Absolute f-Values. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/DK7Y-YR63.


Very few absolute oscillator strengths (f-values) are known for lines in complex spectra; little confidence can be placed in most of the results which have been reported. In an effort to remedy this situation an atomic beam apparatus was constructed and used for the experimental determination of the absolute f-values of resonance lines in the Fe I, CR I, Mn I, and Cu I spectra. The theory of the formation of absorption lines when light from a source of continuous radiation passes through an atomic beam was developed and is presented in some detail. The atomic beam apparatus, devices for temperature measurement and control, and methods for determining the density of atoms in the atomic beam are described. A discrepancy was noticed between the predicted and observed variation of the total absorption for a particular line with the number of absorbing atoms. The observed relation was used as an auxiliary means for the determination of absolute f-values in a manner which is described at length. Since the resulting f-values differ somewhat from those calculated from the data on the basis of the atomic beam theory, both sets of results are reported. Recommendations are made for further research to resolve this problem.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Physics and Mathematics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Physics
Minor Option:Mathematics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • King, Robert Burnett
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1955
Record Number:CaltechETD:etd-12102003-104042
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4920
Deposited By: Imported from ETD-db
Deposited On:12 Dec 2003
Last Modified:28 Jun 2023 21:03

Thesis Files

PDF (Davis_mh_1955.pdf) - Final Version
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