Absorption and luminescent excitation spectra of F and M centers in Kcl and NaF
Boettler, James Leroy
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https://hdl.handle.net/2142/23988
Description
Title
Absorption and luminescent excitation spectra of F and M centers in Kcl and NaF
Author(s)
Boettler, James Leroy
Issue Date
1966
Doctoral Committee Chair(s)
Compton, W.D.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
absorption spectra
luminescent excitation spectra
F centers
M centers
Sodum chloride (KCl)
Sodium fluoride (NaF)
F band
M band
M2 transition
Language
en
Abstract
Luminescent excitation spectra were measured for the F and M centers
in KCl; in particular, for the F band, M band, and the M2 transition. In
all 3 cases, the spectra were nearly double-Gaussian in shape, and the
efficiency for luminescence was nearly independent of the wavelength of
the exciting light. A comparison of the absorption spectrum with the
excitation spectrum of the F-band region of crystals with M centers present
and oriented provided further evidence for the existence of the M2
transition of van Doorn and Haven and of Okamoto, and against the energy transfer
theory of Lambe and Compton. The efficiency for luminescence of
the M center upon M-band excitation was equal to the efficiency for F
centers in pulse-annealed crystals of low F-center concentrations. The
ratio of the efficiencies of the Ml to M2 transitions was 1.2 ± .25.
The oscillator strengths of 3 of the M-center transitions in KCl
relative to the oscillator strength for the F center were found to be in
better agreement with the results reported by Okamoto, than with the
results reported by Delbecq. The polarization of luminescence of M centers
in KCl was measured at right angles to the exciting light, and was found to
agree with the predictions of the van Doorn-Haven model of the M center.
In NaF crystals having no absorption bands to the red side of the M
band, the absorption and excitation spectra of the M band were accurately
double-Gaussian over a wide range of wavelengths; the efficiency of
luminescence of the M center was independent of the wavelength of the
exciting light in that range; and the polarization of luminescence upon
M-band excitation agreed well with the calculations based on the van DoornHaven
model of the M center, In crystals in which the F band was bleached
sufficiently to make it smaller in absorption height than the M band,
several new color centers appeared on the red side of the M band, in
contrast to the results reported by Blum; in these crystals, the polarization
of luminescence of the M center upon M-band excitation disagreed strongly
with theory, even though the absorptions for the new color centers were
small compared to the M-band absorption.
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