Chemisorption of 1,1-dichloroethene on the Si(1 1 1)-7 × 7 surface |
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Authors: | T.H. Andersen,I.-H. Svenum,A. Borg,L.J. Sæ thre |
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Affiliation: | a Department of Physics, Norwegian University of Science and Technology, Høgskoleringen 5, NO-7491 Trondheim, Norway b Department of Chemistry, University of Bergen, Allégaten 41, NO-5007 Bergen, Norway |
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Abstract: | Chemisorption of 1,1-dichloroethene (Cl2CCH2) to a Si(1 1 1)-7 × 7 surface was studied by means of X-ray photoelectron spectroscopy using synchrotron radiation, recording chlorine 2p and carbon 1s spectra. For carbon 1s, spectral assignment of the chemisorbed species is based on quantum chemical calculations of chemical shifts in model compounds.The results confirm the identity of covalently bonded 1-chlorovinyl (-CClCH2) and vinylidene (CCH2) adspecies. Upon chemisorption at room temperature it was found that about one-third of the molecules break one C-Cl bond while about two-thirds of the adsorbates break two C-Cl bonds. We do not, however, find evidence for isomerization of CCH2 to di-bonded vinylene (-CHCH-). |
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Keywords: | Synchrotron radiation photoelectron spectroscopy Si(1 1 1)-7 × 7 1,1-Dichloroethene Vinylene Dechlorination Chemisorption Density functional calculations |
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