C. Niedermayer et al., SIMULTANEOUS OBSERVATION OF MUONIUM AND MULTIPLE FREE-RADICALS IN MUON-IMPLANTED C-70, Physical review. B, Condensed matter, 47(16), 1993, pp. 10923-10926
Positive muons injected into solid C70 form a vacuumlike muonium (Mu)
state with a 25% probability. This state is attributed to muons inside
the C70 cage (C70:MU). In addition, three different types of muonated
free radicals, distinguishable by their hyperfine coupling constants,
are observed. These radicals are attributed to muonium addition on th
e outside of the C70 molecule at different sites. The hyperfine parame
ters of these radicals reflect the different degrees of delocalization
of the unpaired electron. The temperature dependence of the depolariz
ation rates yields information on the dynamics of the C70 molecules.