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Electron relaxtion after an instantaneous application of a dc electric field ranging from 10 V/cm to 1 kV/cm is studied numerically by a many‐particle Monte Carlo method. The model takes into account polar optical, acoustic, and impurity scattering in the nonparabolic central valley. In the limited range of doping, electric field, and temperature the electron mean energy and drift velocity oscillate. The oscillation frequency is nearly proportional to the applied electric field (approximately 35 GHz at 60 V/cm). The oscillations are associated with a shuttle‐type electron motion in the Debye sphere of k‐space they are not heavely damped if the electron runaway is favoured inside and restrained outside the Debye sphere.

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