光学二次谐波法研究乙醇与吸附于银表面的分子态氧的相互作用

Study on the interaction between ethanol and molecular oxygen adsorbed on silver surface by second harmonic generation

本文报道了在超高真空环境下,首次利用光学二次谐波法研究乙醇与预吸附分子态氧的多晶银表面相互作用的过程,发现乙醇与分子态氧的相互作用是由两个过程组成:一个是乙醇在表面因分子态氧的存在而导致的吸附增强过程;另一个是乙醇与分子态氧的反应过程。从测量这一体系的二次谐波信号升温谱,还可以得到乙醇与分子态氧作用强弱的信息。

In this paper, we report the first study on interaction of ethanol with molocular oxygen pre-adsorbed on a polyorystalline silver surface by optical second harmonic generation (SHG) in an ultrahigh vacuum system. It is found that the interaction consists of two process, one is the enhanced adsorption of ethanol induced by molecular oxygen: the other is the reaction of ethanol with molecular oxygen. From the temperature spectrum measured by heating the adsorbed system, we obtain the desorption temperature of reactant and interactive strength of ethanol with molecular oxygen.