摘要
Ultra-violet photoemission spectroscopy measurements for CO adsorption on the(2×2)-Cs precovered Ru(0001)surface were performed.The Cs 5p(5p3/2)level(Cs state)locates at 11.3 eV in binding energy for the(2×2)-Cs overlayer on Ru(0001).Upon the CO adsorption,a new peak,which is associated with the Cs 5p state for the Cs adatoms influenced by the neighbouring CO adsorbed(the Cs+CO state),appears at the lower binding energy side of the Cs state.This new peak is at 10.8,eV for the CO saturation where the(2×2)-Cs+2CO compound layer is formed.This result gives clear evidence for local interaction of Cs and CO on the Ru(0001)surface.
基金
Supported by the National Natural Science Foundation of China under Grant Nos.19774047 and 19874053
the National Hi-Tech Inertial Confinement Fusion Committee.
