Abstract
Three distinct electronic states were detected for positive muons (μ+) after implantation into a C60 powder sample. About 40% of the μ+ remained in the bare (“diamagnetic”) state, essentially an interstitial charged point particle. The rest of the muons were found to thermalize predominantly in two muonium (Mu=μ+ e−) atomic species. A “vacuum” Mu state, with hyperfine coupling close to that of free Mu, most likely at the molecular center, and a muonic substituted radical, i.e. a hydrogen-like Mu addition to double bonds on the carbon rings. This opens up a rich subfield of fullerene spectroscopy using muons.
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Ansaldo, E.J., Boyle, J., Niedermayer, C. et al. Formation of muonium and a muonic radical in fullerene. Z. Physik B - Condensed Matter 86, 317–318 (1992). https://doi.org/10.1007/BF01323722
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DOI: https://doi.org/10.1007/BF01323722