Squeezing and shielding of atoms in fullerene traps

Ideal trapping behavior was recently discovered for nitrogen incased in C60 and C70, although significant increase of Fermi contact interaction gave evidence for compression of the atomic spin distribution. Fullerene cages therefor are candidates for the study of atomic orbital interaction with inert confinements. Prolate deformation of the spin and charge distribution of nitrogen in C70 was detected by high resolution ENDOR spectroscopy. Magnetic shielding averaged over the extended electronic orbitals in poly anions of fullerenes was found to be similar but not identical to the values measured for helium atoms at the cage center of the cages.