乙烯在Ru(10 0)表面的吸附与分解的ARUPS研究

THE DESORPTION AND DISSOCIATION OF ETHYLENE (C_2H_4) ON Ru(10 0) SURFACE BY ARUPS

本文研究了在低温下 ( 2 0 0 K以下 )乙烯 ( C2 H4)在 Ru( 1 0 1- 0 )表面的吸附 ,在衬底温度升高至 2 0 0 K以上后 ,分解形成乙炔 ( C2 H2 ) .价态 σCC和 σCH轨道能级向高结合能方向分别移动了 0 .5和 1 .1 e V.在 Ru( 1 0 1- 0 )表面 ,无论是低温时以分子吸附态存在的乙烯 ,还是温度升高后脱氢分解形成的乙炔 ,其 C-C键轴都是沿衬底〈0 0 0

Studies have been made on the ethylene (C 2H 4),which is adsorbed on Ru(10 1-0) surface below 200 K and is dehydrogenated into acetylene (C 2H 2) at 200 K.After the dehydrogenation,the binding energy of σ CC and σ CH bonds has an increase of 0.5 eV and 1.1 eV respectively.The axis of C C bond of both ethylene (C 2H 4) and acetylene (C 2H 2) tends to lean on Ru(10 1-0) surface in the 〈0001〉 direction.