Abstract
This report is on the observation of unique anomalous multiphonon scattering of Raman and hyper-Raman at room temperature and low-temperature of 81K in ZnO nanoparticles prepared by dc arc plasma method. E2low, E2high, A1(LO), A1(TO) and E1(LO) are among the fundamental modes that are also observed by hyper-Raman. In general, the anomalous modes are not usually observed in most ZnO samples. However, the presence of different types of anharmonic decay processes such as overtone, two phonon and three phonon combinations and their symmetry nature are discussed in detail. These ZnO materials have strong carrier-phonon coupling when irradiated with the 514 nm and 785 nm of excitation sources and also the material is highly responsive in the IR region.
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