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用同位素跳跃技术(Isotope Switch)和热脱附谱技术研究了 Re(0001)面上 CO的交换反应,明确指出气相压强下,CO 同位素交换动力学是非线性的,不能用一级动力学简单处理.讨论了吸附支持脱附现象,提出了协同吸附-脱附机理,并指出两种同位素吸附分子之间存在动态屏蔽效应,而这种屏蔽效应是同位素交换过程的一种机理特征.
The exchange reaction of CO on the Re (0001) surface was studied by Isotope Switch and thermal desorption spectroscopy. It was clearly pointed out that the CO isotope exchange kinetics is non-linear at gas pressure and can not be easily treated by first-order kinetics The phenomenon of adsorption - desorption was discussed, and the mechanism of synergistic adsorption - desorption was proposed. It was also pointed out that there was a dynamic screening effect between two kinds of isotope adsorption molecules, and this shielding effect was a mechanism characteristic of isotope exchange process.