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In this letter, using both off-resonant and resonant Raman spectroscopic techniques, the correlation of optical phonons and structural disorder in As + implanted ZnO single crystals has been investigated. An additional broad peak shoulder at 550 cm −1 between the transverse optical and longitudinal optical ͑LO͒ phonons was clarified to be resonant Fröhlich optical phonon mode in the framework of effective dielectric function. Under resonance condition, an asymmetric broadening and softening ofdoi:10.1063/1.3067997 fatcat:26gzif37bzfsjmu7eot6if6dki