Is it possible for two or more photons to collide simultaneously with one electron, resulting in the emission of that electron from the metal surface? I searched for two photon absorption and found that an atom or molecule can absorb two photons if the sum of their energies is greater than the work function, but I want to know whether it is possible for two or more photons to interact with a single electron and cause its emission?
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2$\begingroup$ It is possible. In general the first photon's stimulation would raise the electron to some quasi-stable state which has a lifetime long enough to allow the second photon's stimulation to supply the necessary energy for ejection. $\endgroup$– MaxWCommented Feb 12, 2019 at 10:46
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1$\begingroup$ Possible duplicate of Photoelectric Effect, Why can't two quanta interact with an electron at the same time? $\endgroup$– Abhinaya SinhaCommented Mar 8, 2019 at 11:15
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