PHOTOLUMINESCENCE AND STRUCTURE OF $C_{60}$ INTERCALATED WITH HELIUM

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Powder x-ray diffractometry was employed to study infusion of He into $C_{60}$ fullerite. It has been shown that the intercalation at a pressure of 1 Bar is a two-stage process, the first stage being the saturation of the octahedral voids, virtually complete after 55 hr. Photoluminescence spectra were taken at 5 K from $C_{60}$ with completely saturated octahedral voids. Helium in the lattice voids is shown to reduce that part of the luminescent emission which is due to 0-0 transitions around 1.69 eV from the so-called deep traps, or according to existing notions, the covalently bound pairs of $C_{60}$ molecules. The effect of He intercalation on polymeric dimer formation is ascribed to the changes in the pentagon to hexagon configuration ratio caused by the intercalation-related increase of the lattice parameter and the formation of bound states of He atoms in the $C_{60}$ lattice voids.

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Author Institution: Verkin Institute for Low Temperature Physics and Engineering; Department of Mechanical Engineering, Northwestern University

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