硝基甲烷在Cu(111)表面吸附的LEED、AES和UPS研究

LEED, AES, UPS STUDIES OF NITROMETHANE ADSORBED ON Cu(111) SURFACE

本文介绍了在低温下运用LEED、AES和UPS研究硝基甲烷在Cu(111)表面的吸附成键和取向。AES和UPS的结果显示了硝基甲烷是以分子形式吸附在Cu(111)表面。随着硝基甲烷暴露量达2L时,与清洁铜表面相比功函数变化有最小值-0.75eV左右。暴露量再增大,功率数略增加,其变化值为-0.5eV。紫外光电子谱表明硝基甲烷是通过其前线轨道氧的2p电子与铜表面的d电子相互作用而产生吸附作用。

The bonding properties of CH_3NO_2 adsorbed on Cu(111) surface are investigated using LEED, AES and UPS at low temperature. The results of AES and UPS show that the nitromethane is molecularly adsorbed on Cu (111) surface. When the exposure of nitromethane is 2.0L, The change of work function Aφ, has a minimum value about — 0. 75eV. The change of work function Aφ, varies to — 0. 5eV with the increasing of exposure. UPS spectra suggest that the adsorbent effect is through the interaction of the oxygen 2p electrons of nitromethane with d electrons of the copper.