TITLE

Secondary oxidation product on Si(111)-(7×7) characterized by isotope-labeled vibrational spectroscopy

AUTHOR(S)
Okuyama, H.; Ohtsuka, Y.; Aruga, T.
PUB. DATE
June 2005
SOURCE
Journal of Chemical Physics;6/15/2005, Vol. 122 Issue 23, p234709
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The reaction of O2 with Si(111)-(7×7) has been studied by electron energy-loss spectroscopy at 82 K. In addition to the losses due to Si–O–Si configurations, we observed two Si–O stretch modes depending on the coverage. A 146-meV peak appears at the initial reaction stage and was ascribed to a metastable product with one oxygen atom bonding on top of Si adatom and the other inserted into the backbond. The initial product is further oxidized to produce the second Si–O stretch peak at 150 meV. The secondary product was partially substituted with isotopes and analyzed with a simple model of coupled oscillators. The vibrational spectra reflect dynamical couplings between the isotopes, which is consistent with those predicted from the tetrahedral SiO4 structure with one on top and three inserted oxygen atoms.
ACCESSION #
17523314

 

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