title: Structures, energetics, and dynamics of helium adsorbed on isolated fullerene ions.
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.
authors.affiliation: Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria.
authors.forename: Christian
authors.initials: C
authors.lastname: Leidlmair
authors.forename: Yang
authors.initials: Y
authors.lastname: Wang
authors.forename: Peter
authors.initials: P
authors.lastname: Bartl
authors.forename: Harald
authors.initials: H
authors.lastname: Schöbel
authors.forename: Stephan
authors.initials: S
authors.lastname: Denifl
authors.forename: Michael
authors.initials: M
authors.lastname: Probst
authors.forename: Manuel
authors.initials: M
authors.lastname: Alcamí
authors.forename: Fernando
authors.initials: F
authors.lastname: Martín
authors.forename: Henning
authors.initials: H
authors.lastname: Zettergren
authors.forename: Klavs
authors.initials: K
authors.lastname: Hansen
authors.forename: Olof
authors.initials: O
authors.lastname: Echt
authors.forename: Paul
authors.initials: P
authors.lastname: Scheier