Effect of applied fields on the optical properties of color centers
Henry, Charles Howard
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https://hdl.handle.net/2142/23974
Description
Title
Effect of applied fields on the optical properties of color centers
Author(s)
Henry, Charles Howard
Issue Date
1965
Doctoral Committee Chair(s)
Slichter, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
applied fields
optical properties
color centers
alkali halides
Language
en
Abstract
"A theoretical analysis is made of the effect of an
external perturbation"" such as an electric field or magnetic
field, on the optical properties of color centerso The analysis
is restricted to centers with orbital singlet ground states.. It
is especially applicable to centers with orbitally degenerate
excited states which are interacting strongly with the lattice»
such as the F center in the alkali halides.. The changes in the
optical properties are described by computing the changes that
occur in the moments of the optical absorption line shape when the
external perturbation is appliedo The changes in the zeroth,\) firstj)
second» and third moments may be computed quite simply., Although
this does not give the detailed change in the line shape, it pro=
videa a precise method for evaluating parameters of the center1
such as the spin-orbit coupling constant of the excited state of
the F centere The method of moments is used to analyze experiments
on the circular dichroism, Faraday rotation, Stark effect, and
Voigt effect of the F center, and the circular dichroism of the
A center.
The analysis of circular dichroism data yields for the
first time a method for determining the separate contributions to
the broadening of the F band due to the cubic vibrational modes,
the non-cubic vibrational modes,\) and the spin-orbit interaction.
The data of Margerie and Romestain on the circular dichroism of the
F band in CsBr and CsCl are analyzed.. The analysis resolves the
discrepancy between their two methods of determining the spin=orbit
splitting (measurement of the peak separation of the resolved
structure and measurement of the circular dichroism)~ and shows that
the structure arises from a combination of a large spin=orbit
coupling and a large non=cubic lattice vibrational interaction."
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