Charging a metal photocathode negatively does not significantly decrease the work function of electrons. While theoretically, a negative charge could reduce the work function, practical applications show minimal effects, particularly on flat surfaces and under realistic voltage conditions. Notably, sharp outer corners of the photocathode may exhibit some influence, but this is not the norm.
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It doesn't, at least not notably. It just makes the electrons fly back after they were released.Christofer Br said:Since positive charge on the photocatode increases work function of electrons
In principle: Yes. In practice you won't see an effect for flat surfaces and realistic voltages. For very sharp outer corners you can see an effect.Christofer Br said:does charging metal photocatode negatively decrease work function?