C_2H_2在Ru(10■0)表面上的分子轨道对称性

Orbital Symmetry of the Acetylene on Ru(10■0) Surface

利用角分辨紫外光电子能谱对低温下（160 K）乙炔（C_2H_2）气体在Ru(10■0)表面的吸附进行了研究.实验结果表明：乙炔的C-C轴并不平行于衬底表面, C-C轴在<0001>晶向和表面法线组成的平面内有一定的倾斜.与气相乙炔分子不同,在Ru(10■0)表面吸附的乙炔分子的C-H轴不是沿C-C轴向.

The acetylene (C_2H_2) adsorbed on Ru(10■0) surface has been studied by using angle-resolved ultraviolet photoelectron spectroscopy (ARUPS). The dependence of the σCC peak intensity on incidence angle and emission angle shows that C-C axis of acetylene（C2H2）is not parallel to the Ru(10■0) surface(see Fig.2). The C-C axis of acetylene is tilted in <0001> azimuth according to its symmetry(see Fig.3). Not as the acetylene in gas phase,the C-H bond of the acetylene adsorbed on Ru (10■0) surface is not along the direction of the C-C bond.