We present results on resonant Raman scattering in single crystal ZnO using a continuously tuneable excitation in the energy region of the free and bound excitons. The PL and Raman spectra show the presence of a dominant luminescence band at 3.310 eV as well as the A1(TO), E2(high), E1(LO), and 2E1(LO) Raman modes at liquid nitrogen temperature. A strong resonance of the Raman scattering cross section was found for the second‐order 2E1(LO) phonon mode. This enhancement is considerably larger than for the non‐polar E2 (high) mode due to Fröhlich interaction. Furthermore, the resonance enhancement at bound excitons was studied at liquid helium temperature proving the essential role of excitonic intermediate states for resonant Raman scattering in ZnO. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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Wagner et al. (2007) studied this question.