Alkali metal dosing (AMD) has been widely used as a way to control doping without chemical substitution. This technique, in combination with angle resolved photoemission spectroscopy (ARPES), often provides an opportunity to observe unexpected phenomena. However, the amount of transferred charge and the corresponding change in the electronic structure vary significantly depending on the material. Here, we report study on the correlation between the sample work function and alkali metal induced electronic structure change for three iron-based superconductors: FeSe, Ba(Fe_0.94Co_0.06)₂As₂ and NaFeAs which share a similar Fermi surface topology. Electronic structure change upon monolayer of alkali metal dosing and the sample work function were measured by ARPES. Our results show that the degree of electronic structure change is proportional to the difference between the work function of the sample and Mulliken's absolute electronegativity of the dosed alkali metal. This finding provides a possible way to estimate the AMD induced electronic structure change.

碱金属配料（AMD）已被广泛用作无需化学替代即可控制掺杂的方法。该技术与角度分辨光发射光谱法（ARPES）结合使用，通常可以提供观察意外现象的机会。然而，转移电荷的量和电子结构的相应变化取决于材料。在此，我们报告了三种铁基超导体FeSe，Ba（Fe _0.94 Co _0.06）₂ As ₂的样品功函数与碱金属诱导的电子结构变化之间的相关性研究。和具有相似费米表面拓扑结构的NaFeAs。用ARPES测量单层碱金属投加后的电子结构变化和样品的功函数。我们的结果表明，电子结构的变化程度与样品的功函数与碱金属的Mulliken绝对电负性之间的差异成正比。这一发现提供了一种可能的方法来估计AMD引起的电子结构变化。