A study of the Raman scattering in Zn_{1-x}Mg_{x}Se (0 ≤ x ≤ 0.4) epilayers grown by molecular beam epitaxy on (100) GaAs and (111)_{Zn} ZnTe substrates has been performed. Two kinds of longitudinal optical phonon modes (LO_{Zn-Se} and LO_{Mg-Se}) were observed under excitation of the Ar^{+} and Kr^{+} laser lines at room temperature, whose frequencies and intensities depend characteristically on the Mg content.
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