CO与K在Cu(111)面上共吸附的角分辨紫外光电子能谱

ARUPS STUDY OF THE COADSORPTION OF CO AND K ON Cu(111)

CO在有K沉积的Cu(111)面上吸附的角分辨紫外光电子能谱(ARUPS)测量结果表明:在室温下,有分子状态的CO吸附在该表面,CO分子的4σ态信号强度明显低于5σ/1π态的强度,这表明CO分子在该状态下是强烈倾斜的,低温下(～150K),有两种不同的CO吸附状态,一种只有在较高CO暴露量下才出现,而另一种则在任何暴露量下都存在,后者是一种类似于CO在室温时的吸附状态。

The results of an angle resolved UPS study on K-CO coadsorbate on Cu(111) show that there is a molecular adsorption state of CO on the Cu(lll) with potassium at room temperature. The low 4σ/(5σ + 1π) intensity ratio suggests that the CO molecules inclined strongly in this state. Two adsorption states of CO are found at low temperatures (-150K). One of them appears for higher CO exposure (≥1L) only, and the other which exists for all (tcposures is similar to that at room temperature.