Vibrational characterization of different benzene phases on flat and vicinal Si(100) surfaces
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2007-10-17Access:
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B. Naydenov and W. Widdra, Vibrational characterization of different benzene phases on flat and vicinal Si(100) surfaces, Journal of Chemical Physics, 127, 15, 2007, 154711-1 - 154711-11Download Item:
Naydenov2007a.pdf (Published (author's copy) - Peer Reviewed) 324.2Kb
Abstract:
Based on high-resolution electron energy loss spectroscopy and temperature-programmable
desorption, benzene chemisorption on vicinal and nominally flat Si 100 surfaces has been studied
for various adsorption, annealing, and site blocking treatments. Three different chemisorbed
benzene C6H6 and C6D6 phases with distinct thermal desorption characteristics and different
vibrational spectra have been separated and characterized on both substrates. All three phases are
identified as 1,4-cyclohexadiene-like structures with butterfly geometry. Whereas the dominant
phase is di- bonded to the two Si atoms of a single Si?Si dimer, the benzene orientation double
bond orientation in the other phases is rotated. Di- bonding to Si atoms of adjacent Si?Si dimer
for the latter cases is most likely. Coverage and temperature dependent conversions between the
different phases have been addressed by vibrational spectroscopy.
Sponsor
Grant Number
Deutsche Forschungsgemeinschaft (DFG)
SFB 338
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http://people.tcd.ie/naydenobDescription:
PUBLISHED
Author: NAYDENOV, BORISLAV; Widdra, Volf
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Journal of Chemical Physics;127;
15;
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