Abstract
A spectroscopic method based on measurements of the luminescence spectra related to the radiative recombination of two-dimensional electrons with photoexcited nonequilibrium holes was applied for direct determination of the intervalley and spin splittings in the energy spectrum of two-dimensional electrons in a perpindicular magnetic field. Strong oscillatory dependences of these splittings on the filling factor have been observed. It is shown that the above mentioned splittings increase by almost an order of magnitude due to the electron-electron interaction.
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