Adsorption of ethylene on Sn and In terminated Si(001) surface studied by photoelectron spectroscopy and scanning tunneling microscopy.
Interaction of ethylene (C2H4) with Si(001)-Sn-2 × 2 and Si(001)-In-2 × 2 at room temperature has been studied using core level (C 1s) X-ray photoelectron spectroscopy with synchrotron radiation and scanning tunneling microscopy. Sn and In form similar dimer chains on Si(001)2 × 1, but exhibit different interaction with ethylene. While ethylene adsorbs on top of Sn dimers of the Si(001)-Sn-2 × 2 surface, the Si(001)-In-2 × 2 surface turned out to be inert. Furthermore, the reactivity of the Sn terminated surface is found to be considerably decreased in comparison with Si(001)2 × 1. According to the proposed adsorption model ethylene bonds to Sn dimers via [2 + 2] cycloaddition by interacting with their π dimer bonds. In contrast, indium dimers do not contain π bonds, which renders the In terminated Si(001) surface inert for ethylene adsorption.
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Petr
P
Zimmermann
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Pavel
P
Sobotík
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Pavel
P
Kocán
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Ivan
I
Ošt'ádal
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Mykhailo
M
Vorokhta
Australian Synchrotron, 800 Blackburn Road, Clayton, Victoria 3168, Australia.
Robert George
RG
Acres
Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, Prague 180 00,Czech Republic.
Vladimír
V
Matolín