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在超高真空条件下,采用功函数连续测量、程序升温热脱附(TDS)、程序升温反应谱(TPRS)等方法,研究了D_2O在电解银表面的吸附和反应。结果表明,在清洁的银表面,D_2O有微量化学吸附,预吸附的氧能显著增强水的吸附,形成OD(D_2O)_n的吸附络合物。程序升温得到二个水脱附峰,峰温为470±4K和641K,分别对应于分子态吸附水和解离态水的脱附。功函数测量表明,分子态水(D_2O)的吸附使表面功函数降低,解离态水(OD)的吸附则增加表面功函数。
The adsorption and reaction of D_2O on the surface of Electrolytic silver were studied by means of continuous work function measurement, programmed temperature desorption (TDS) and temperature programmed reaction (TPRS) under ultrahigh vacuum conditions. The results showed that D 2 O had a small amount of chemisorption on the clean silver surface. Preadsorption of oxygen significantly enhanced water adsorption and formed an adsorption complex of OD (D 2 O) _n. The program was heated to get two water desorption peaks, the peak temperature of 470 ± 4K and 641K, respectively, corresponding to molecular adsorption of water and dissociated water desorption. The work function measurements show that the adsorption of molecular water (D 2 O) decreases the work function of the surface and the adsorption of dissociated water (OD) increases the work function of the surface.