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An experimental determination of the absolute oscillator strengths of some resonance transitions of chromium and nickel

Citation

Estabrook, Frank B. (1950) An experimental determination of the absolute oscillator strengths of some resonance transitions of chromium and nickel. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/15FS-N093. https://resolver.caltech.edu/CaltechTHESIS:10042016-142730356

Abstract

A brief account is given of the classical electron theory of anomalous dispersion and line absorption. The oscillator strength, or f-value, is introduced as the factor involved in taking over the results of classical theory in a modern quantum mechanical formulation. The relation between f-values and the transition probabilities of Einstein is derived.

A summary of methods for experimental determination of f-values for atomic transitions is given, and in particular the method of total absorption is considered in detail. The equivalent width or total absorption of an absorption line is defined, and the relation of this to the oscillator strength of the line, the so-called curve of growth, qualitatively explained.

The laboratory apparatus used in the present investigation is described in detail, as are the methods of obtaining and reducing the experimental data.

An account is given of unsuccessful experiments on the resonance lines of Ca. Absolute nf-values obtained for three lines of Cr are reported, and on the basis of unsatisfactory vapor pressure data, tentative absolute f-values for these lines are assigned. Absolute f-values for three lines of the Ni spectrum are reported, the vapor pressure data for Ni being reliable. A conversion factor is obtained by which the relative gf-values for Ni given by King may be reduced to an absolute scale.

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):
  • King, Robert Burnett
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1950
Record Number:CaltechTHESIS:10042016-142730356
Persistent URL:https://resolver.caltech.edu/CaltechTHESIS:10042016-142730356
DOI:10.7907/15FS-N093
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9933
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:04 Oct 2016 22:19
Last Modified:21 Dec 2019 04:35

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