Abstract
High field-high frequency electron spin resonance (esr) spectroscopy is applied to the determination of spin parameters for metallofullerenes. The esr measurements combined with multi-frequency microwave are in-dispensable for unambiguous determination of the parameters. The magnetic field independent terms in the spin Hamiltonian can be easily distinguished from the dependent ones by using the multi-frequency esr measurements. The orientation-dependent g-tensor of La@C82 can be determined by W-band measurements. The fine structures in the high spin system of Eu@C82 are clearly analyzed by the combination of W-band spectroscopy with X-band one. In Gd@C82 there are two spin sites within a molecule, the high spin site on the Gd3+ ion and the other radical site on the fullerene cage. The exchange interaction is valued by the temperature dependent W-band measure-ments. The large hyperfine interaction due to La2 dimer nuclei within C80 is investigated for La2@C80 anion.
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