K/Cu(111)表面功函数的变化

THE WORK-FUNCTION CHANGE OF K/Cu(111)

本工作用俄歇电子能谱(AES)测定K在Cu(111)表面上的覆盖度,用Kelvin探头测量表面功函数的变化,得出功函数依赖于K覆盖度的关系曲线,功函数最大变化值△φ_(max)=3.14eV,功函数最小时的覆盖度θ_(min)=0.18,初始偶极矩p(0)=7.0Debye,实验结果与武汝前等人的理论模型相一致。

The work-function change of potassium on the Cu(111) surface was studied. The work-function change was measured by a Kelvin probe. The coverage of potassium on the surface was determined by AES. Maximum work-function change Δφmax:=3.14 eV. Initial dipole moment p(0) = 7.0 Debye, The minimum work-function occurs at the coverage θmax,= 0-18. The result of this work is consistent with that of the jellium-slab model[5].