1. Radio-frequency muon spin resonance studies of endohedral and exohedral muonium adducts of fullerenes
- Author
-
S. Sun-Mack, Brenda Addison-Jones, Paul W. Percival, and Jean-Claude Brodovitch
- Subjects
Larmor precession ,Fullerene ,Muon ,Solid-state physics ,Chemistry ,Muonium ,Resonance ,High Energy Physics::Experiment ,Atomic physics ,Muon spin spectroscopy ,Hyperfine structure ,Atomic and Molecular Physics, and Optics - Abstract
The radio-frequency muon spin resonance technique (RF-μSR) is described, with examples drawn from muon studies of fullerences. Two distinct species can be detected by RF-μSR when solid C60 is irradiated with positive muons. Endohedral muonium (Mu@C60) is characterized by a muon hyperfine constant (Aμ) close to the vacuum value. A remarkable feature of the RF-μSR spectrum is the double quantum transition, which appears when the allowed transitions are saturated. The exohedral muonium adduct (C60Mu) is also detected, and has a much smaller value ofAμ typical of a carbon-centred organic radical. It has been studied by RF-μSR in dilute solution, which is not possible for transverse field muon spin rotation (TF-μSR). There is a significant difference inAμ of C60Mu in the solid and in solution, a result of great import to the analysis of avoided-level crossing experiments on13C60Mu.
- Published
- 1996