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Spectroscopy of C60 single molecules: the role of screening on energy level alignment

Isabel Fernández Torrente, Katharina J Franke and Jose Ignacio Pascual

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In this paper we investigate the electronic properties of single molecules by means of low-temperature scanning tunneling spectroscopy (STS). We focus on C60 molecules deposited on a Au(111) surface at different substrate temperatures and mixed with two different hydrocarbons. In this way we change the fullerene interaction with the surface and/or the dipolar response of the molecular neighborhood to charging events. We explore the dependence of the energy level alignment on the molecular surroundings. The results confirm an already established picture in photoelectron spectroscopy.


PACS

71.20.Tx Fullerenes and related materials; intercalation compounds

73.20.At Surface states, band structure, electron density of states

68.43.-h Chemisorption/physisorption: adsorbates on surfaces

73.20.Hb Impurity and defect levels; energy states of adsorbed species

Subjects

Condensed matter: electrical, magnetic and optical

Surfaces, interfaces and thin films

Dates

Issue 18 (7 May 2008)

Received 3 March 2008, in final form 17 March 2008

Published 17 April 2008



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