Understanding the Effect of Dispersion Corrections on the Calculated Spectra of $\alpha$-Lactose Monohydrate

THz spectra were recorded for a polycrystalline α-lactose monohydrate sample at 4 K. Solid-state DFT was then used to aid the interpretation of the spectrum. In particular, we investigate how the inclusion of a number of empirical dispersion corrections to the DFT calculations influences the correlation between calculation and experiment.