Permanent URL to this publication: http://dx.doi.org/10.5167/uzh-3441
Muntwiler, M; Auwarter, W; Seitsonen, A P; Osterwalder, J; Greber, T (2005). Rocking-motion-induced charging of C60 on h-BN/Ni(111). Physical Review. B, Condensed Matter and Materials Physics, 71(12):121402.
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One monolayer Of C-60 on one monolayer of hexagonal boron nitride on nickel is investigated by photoemission. Between 150 and 250 K the work function decreases and the binding energy of the highest-occupied molecular orbital increases by AP; 100 meV. In parallel, the occupancy of the-in the cold state almost empty-lowest unoccupied molecular orbital (LUMO) changes by 0.4PLUSMN; 0.1 electrons. This charge redistribution is triggered by the onset of molecular rocking motion, i.e., by orientation dependent tunneling between the LUMO Of C-60 and the substrate. The magnitude of the charge transfer is large and cannot be explained within a single-particle picture. It is proposed to involve electron-phonon coupling where C-60(-) polaron formation leads to electron self-trapping.
|Item Type:||Journal Article, refereed, original work|
|Communities & Collections:||07 Faculty of Science > Institute of Physical Chemistry|
07 Faculty of Science > Physics Institute
|Deposited On:||26 Mar 2009 21:05|
|Last Modified:||23 Nov 2012 15:10|
|Publisher:||American Physical Society|
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