AbstractThe multimode Jahn‐Teller effect for the tetrahedral2T2term coupled with E and T2vibrations is discussed taking into account the spin—orbit interaction. Harmonic vibrations are considered at the trigonal minimum point of the lowest sheet of the adiabatic potential. Using the Green's function method the redetermined projected densities of states are obtained. The one‐phonon sideband of the2E →2T2transition is expressed in terms of projected densities and compared with the experimental data for2E →2T2luminescence of