Structures, energetics, and dynamics of helium adsorbed on isolated fullerene ions |
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Authors: | Leidlmair Christian Wang Yang Bartl Peter Schöbel Harald Denifl Stephan Probst Michael Alcamí Manuel Martín Fernando Zettergren Henning Hansen Klavs Echt Olof Scheier Paul |
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Affiliation: | Institut für Ionenphysik und Angewandte Physik, Universit?t Innsbruck, Innsbruck, Austria. |
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Abstract: | Helium adsorbed on C(60)(+) and C(70)(+) exhibits phenomena akin to helium on graphite. Mass spectra suggest that commensurate layers form when all carbon hexagons and pentagons are occupied by one He each, but that the solvation shell does not close until 60 He atoms are adsorbed on C(60)(+), or 62 on C(70)(+). Molecular dynamics simulations of C(60)He(n)(+) at 4 K show that the commensurate phase is solid. Helium added to C(60)He(32)(+) will displace some atoms from pentagonal sites, leading to coexistence of a registered layer of immobile atoms interlaced with a nonregistered layer of mobile atoms. |
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