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P. W. Percival B. Addison-Jones J. -C. Brodovitch S. Sun-Mack 《Applied magnetic resonance》1996,11(2):315-323
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 (A μ) 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 ofA μ 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 inA μ of C60Mu in the solid and in solution, a result of great import to the analysis of avoided-level crossing experiments on13C60Mu. 相似文献
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S. R. Kreitzman T. Pfiz S. Sun-Mack T. M. Riseman J. H. Brewer D. Ll. Williams T. L. Estle 《Hyperfine Interactions》1991,64(1-4):561-566
The ionization of muonium centers in Si and GaAs have been studied using radio frequency (RF) resonant techniques. In Si all
three muonic centers are detectable by RF. No evidence was found for delayed Mu and Mu* states at any temperature. However, our results on the diamagnetic final state (μ
f
+
) show that it is composed of prompt fractions (as seen by conventional μSR) and delayed fractions arising from the ionization
of Mu* and Mu. We observe a full μ
f
+
fraction at 317 K when the Mu relaxation rate is above 10 μs−1. GaAs differs from the situation in Si in that we observed only a partial conversion of Mu* and Mu to a μ+ final state up to 310 K in spite of the fact that the transverse field relaxation rates become very high at 150 and 250 K
respectively. 相似文献
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