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µSR studies of elemental boron, modelling interstitial protons with implanted positive muons
Author(s) -
Cox S. F. J.,
Cottrell S. P.,
Lord J. S.,
Scott C. A.,
Jayasooriya U. A.,
Hopkins G. A.,
Suleimanov N.
Publication year - 2000
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/1097-458x(200006)38:13<::aid-mrc692>3.0.co;2-4
Subject(s) - muon spin spectroscopy , chemistry , muon , boron , relaxation (psychology) , quadrupole , dipole , spin–lattice relaxation , nuclear magnetic resonance , atomic physics , nuclear quadrupole resonance , molecular physics , nuclear physics , physics , psychology , social psychology , organic chemistry
Studies of positive muons implanted into solid elemental boron illustrate the various µSR techniques of muon spin rotation, relaxation and resonance. The chemical behaviour of positive muons and protons being similar, the local magnetic dipole and electrical quadrupole interactions with the boron nuclei determined by these measurements should characterize the crystallographic site and electronic structure of interstitial protons. Muon diffusion through the boron lattice becomes significant only above 500 K, with an activation energy of 0.33(2) eV, as determined from motional narrowing of the rotation spectrum and evolution of the zero‐field relaxation function. The strong spin–spin couplings in boron prove suitable for demonstrating various techniques of radiofrequency and level‐crossing resonance, and also a novel form of spin echo detected in null external field. Copyright © 2000 John Wiley & Sons, Ltd.