室温Fe(110)面CO吸附的HREELS和LEED研究

HREELS AND LEED STUDY OF CO ADSORPTION ON Fe (110) AT ROOM TEMPERATURE

本工作用HREELS和LEED对CO在室温Fe(110)面上的吸附进行了研究。HREELS的结果表明,在CO暴露量小于2L时,只有分子态的CO直立吸附于表面顶位。在暴露量大于2L时,出现了一个新的能量损失峰,其频率比分子吸附CO的CO—Fe振动频率更低,为414cm^(-1)。这是分解的CO的C吸附于表面产生的能量损失。在CO暴露量为40L时,观察到了(5×1)的CO吸附结构,在表面CO吸附接近饱和时,观察到了(2×1)结构。

CO adsorption on Fe (110) at room temperature was investigated using High Resolution Electron Energy Loss Spectroscopy and Low Energy Electron Diffraction. HREELS results show that CO was adsorbed on Fe (110) molecularly before 2L CO exposure. Dissociation of CO was observed at higher CO exposure. An incomplete LEED pattern of(5×1)was observed at 40L CO exposure, when the CO exposure was increased to 250L, a(2×1)LEED pattern was observed.