The interaction between the field emission resonance states and thephotodetached electron in an electric field is studied by semiclassical theory.An analytical expression of the photodetachment cross section is derived in theframework. It is found that the Stark shifted image state modulates thephotodetachment cross section by adding irregular staircase or smoothoscillation in the spectrum. When the photodetached electron is trapped inStark shifted image potential well, the detachment spectrum displays anirregular staircase structure which corresponds to the modified Rydberg series.While the photodetached electron is not bound by the surface potential well,the cross secton contains only a smooth oscillation due to the reflection ofelectronic wave by the field or the surface.
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