用同位素跳跃技术和热脱附谱技术研究了CO~(16)/Re(0001)在混合同位素(CO~(16)+CO~(18))气氛下的脱附,指出在混合同位素气氛下CO~(16)的脱附动力学仍是非线性的,但是迄今为止文献上都简单地假定同位素交换速度服从一级动力学公式.我们根据协同吸附-脱附机理的假定,对脱附动力学的非线性现象提出了合理解释,并强调指出由于表面上不同同位素之间存在着动态屏蔽效应,所以在同位素交换过程中,脱附速度一般都不是一级的,只是对t→0的初始脱附速度而言,此时屏蔽效应等于零,一级动力学公式才是正确的. The desorption of CO ~ (16) / Re (0001) under a mixed isotope (CO ~ (16) + CO ~ (18)) atmosphere was studied by isotope jump technique and thermal desorption spectroscopy. The desorption kinetics of CO ~ (16) is still non-linear, but so far the literature simply assumes that the isotopic exchange rate obeys the first-order kinetic equation. According to the assumptions of the synergistic adsorption-desorption mechanism, It is emphasized that the desorption velocity is not generally one-order in the process of isotope exchange due to the dynamic shielding effect between different isotopes on the surface, but only for the initial off of t → 0 With the speed, the shielding effect is equal to zero at this time, the first-order kinetic formula is correct.