Date of this Version
Physical Review Letters (June 2004) 92(22):223601. DOI: 10.1103/PhysRevLett.92.223601. PACS numbers: 33.80.Rv, 42.50.Hz.
We discuss electron diffraction from two counterpropagating light waves with two different frequencies.We show that, even though these waves do not form a standing wave, electron diffraction similar to the conventional Kapitza-Dirac effect, i.e., scattering on a standing wave, is still possible. The nonlinear response of the electron to the laser fields creates a stationary diffraction grating from which the same electron scatters.