Localization of helium at an aromatic molecule in superfluid helium clusters

Analysis of the helium distribution around a benzene molecule in a He-4(N) cluster with the path integral method shows evidence of near complete local ization of two He-4 atoms at positions above and below the molecular plane. These two atoms are only very weakly coupled to the remainder of the first solvation shell by permutation exchanges, implying that these atoms are ef fectively removed from the superfluid solvation. The implications of such l ocalization for molecular spectra in helium clusters are discussed. (C) 200 1 American Institute of Physics.