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利用扫描隧道显微镜研究了在低温(80 K)下乙醇分子在TiO2(110)面的光解离过程.在这种温度下,大部分乙醇分子都以分子吸附的形式吸附在表面五配位钛位.在紫外光照射之后,乙醇发生了光解离,两种不同的产物特征被探测到.使用针尖操控技术对其中一种产物特征进行了详细的分析,成功了解了它的构成,中间一个五配位钛位吸附的乙醛分子加上位于左右两个不同氧列的羟基构成了这种产物.接着实施了多次光照实验来进一步研究乙醇两种光解离产物特征之间的联系.  相似文献
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As the photo-dissociation product of methanol on the TiO2(110) surface,the diffusion and desorption processes of formaldehyde (HCHO) were investigated by using scanning tunneling microscope (STM) and density functional theory (DFT).The molecular-level images revealed the HCHO molecules could diffuse and desorb on the surface at 80 K under UV laser irradiation.The diffusion was found to be mediated by hydrogen adatoms nearby,which were produced from photodissociation of methanol.Diffusion of HCHO was significantly decreased when there was only one H adatom near the HCHO molecule.Furthermore,single HCHO molecule adsorbed on the bare TiO2(110) surface was quite stable,little photo-desorption was observed during laser irradiation.The mechanism of hydroxyl groups assisted diffusion of formaldehyde was also investigated using theoretical calculations.  相似文献
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