PHOTOINDUCED PRODUCTS IN AC60MONOLAYER ON${\rm Si}(111) (\sqrt{3}\times \sqrt{3})\hbox{-}{\rm Ag}$: AN STM STUDY

T. Nakayama (), J. Onoe, K. Nakatsuji, J. Nakamura, K. Takeuchi and M. Aono
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T. Nakayama: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
J. Onoe: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
K. Nakatsuji: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
J. Nakamura: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
K. Takeuchi: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
M. Aono: The Institute of Physical and Chemical Research, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan;

Surface Review and Letters (SRL), 1999, vol. 06, issue 06, 1073-1078

Abstract: Irradiation of ultraviolet-visible light onto aC60monolayer on${\rm Si}(111) (\sqrt{3}\times \sqrt{3}){\rm R30}^\circ\hbox{-}{\rm Ag}$resulted in a chemical reaction between adjacentC60molecules, as confirmed by scanning tunneling microscopy (STM) images. The major photoinduced products were double-bonded (two covalent C–C bonds between molecules)C60dimers and linear trimers. We also found single-bonded (single covalent bond between molecules)C60dimers and linear trimers, and two-dimensionalC60oligomers as minor products. Observed atomic geometry of the nonbonding contact between aC60dimer (or a trimer) and a neighboring dimer (or a trimer), which are parallel to each other regarding their axes, is different from that reported betweenC60molecules in three-dimensionalC60crystals, where there is no interaction with a substrate.

Date: 1999
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DOI: 10.1142/S0218625X99001177

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