The sensitivity of nuclear magnetic double resonance
Spencer, Paul Roger
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https://hdl.handle.net/2142/25800
Description
Title
The sensitivity of nuclear magnetic double resonance
Author(s)
Spencer, Paul Roger
Issue Date
1969
Doctoral Committee Chair(s)
Slichter, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
nuclear magnetic double resonance
rf field
quadrupole shifted transitions
Language
en
Abstract
The dynamics of the nuclear magnetic double resonance
process for Na nuclei in a (2,0,0) position relative to a
substitutional Ag+ impurity in NaCl has been studied for several
Ag concentrations. The purpose was to determine experimentally
the factors which limit the double resonance sensitivity. For
Ag concentrations below .03 mole %, the magnetization of unperturbed
Na nuclei decayed exponentially with rates proportional
to the impurity concentration when an rf field at the resonance
frequency of the quadrupole shifted transitions was applied.
Using a new method, intermittent search field irradiation,
evidence was found that the finite spin diffusion rate caused
a double resonance energy transfer rate under continuous search
field irradiation about 30% less than the transfer rate which
would be observed if the spin diffusion were infinitely fast.
A theoretical explanation of the results is given using a
perturbation approach based on the concept of spin diffusion.
In addition, we have studied the Na spin lattice relaxation
in the completely demagnetized state as a function of impurity
concentration, and found a rapid initial decrease of spin
order. This was caused by cross relaxation within then nuclear
spin system.
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