After formation of Sb-Cs dipole layer through alternating depostion of Sb and Cs, the photosensitivity of the cathodes depends sensitively on both the number of absorbed Cs atoms and the dipole moment of Sb-Cs dipole layer formed on Na_2KSb surface.

• Sb，Cs交替形成锑铯偶极层，在Na_2KSb上吸附的铯原子数和感应的偶极层的偶极矩同时影响多碱光电阴极的灵敏度。