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We demonstrate the determination of anharmonic acoustic phonon properties viasecond-order Raman scattering exemplarily on copper iodide single crystals. Theorigin of multi-phonon features from the second-order Raman spectra wasassigned by the support of the calculated 2-phonon density of states. In thisway, the temperature dependence of acoustic phonons was determined down to10\,K. To determine independently the harmonic contributions of respectiveacoustic phonons, density functional theory (DFT) in quasi-harmonicapproximation was used. Finally, the anharmonic contributions were determined.The results are in agreement with earlier publications and extend CuI'sdetermined acoustic phonon properties to lower temperatures with higheraccuracy. This approach demonstrates that it is possible to characterize theacoustic anharmonicities via Raman scattering down to zero-temperaturerenormalization constants of at least 0.1\,cm$^{-1}$.

Determination of acoustic phonon anharmonicities via second-order Raman scattering in CuI