Nuclear magnetic resonance study of quantum size effects in supported platinum particles
Durand, Dale James
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https://hdl.handle.net/2142/23943
Description
Title
Nuclear magnetic resonance study of quantum size effects in supported platinum particles
Author(s)
Durand, Dale James
Issue Date
1989
Doctoral Committee Chair(s)
Slichter, C.P.
Department of Study
Physics
Discipline
Physics
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Nuclear magnetic resonance (NMR)
quantum size effects
supported platinum particles
carbon monoxide monolayer
nonmetallic spin-lattice relaxation
Knight shift
Language
en
Abstract
The author has observed, and studied quantum size
effects in the NMR of small, supported platinum particles
with a monolayer of carbon monoxide chemically adsorbed to
the surface. The effects are observed in the 13c and 195pt
NMR, primarily at 4.2K. He reports nonmetallic spin-lattice
relaxation, and changes in the Knight shift at low
temperatures.
He shows that the variation of the quantum size effects
at 4.2K with particle size is consistent with a prediction
based on simply scaling the bulk density of states at the
Fermi energy with the volume of the particles. An
interpretation is proposed based on the relative sizes of the
electron Zeeman energy and the level spacing of particular
particles.
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