ULF-Raman) spectroscopy and complementary terahertz time-domain spectroscopy (THz-TDS). [9] Presently, most ULF-Raman research focuses on nanomaterials, revealing the lowest frequency peaks of various origins: ≈20 cm −1 (≈0.60 THz) Au-Au stretching of Au 8 clusters, [10a] 21.4-32.5 cm −1 (0.64-0.97 THz) shear modes of multilayer ME 2 (M = Nb, Mo, W, Re, and Pt; E = S, Se, and Te), [10b] 23-34.5 cm −1 (0.69-1.03 THz) modes of pharmaceutical crystals, [10c] 28 cm −1 (0.84 THz) vibrations of orthorhombic α-S 8 crystals, [10d] 31 cm −1 (0.93 THz) out-of-plane acoustic phonons of multilayer graphene, [10e] 34 cm −1 (1.02 THz) lattice vibrations of highly ordered ferroquine crystals, [10f ] 38 cm −1 (1.14 THz) vibrational motion of lysozyme protein, [10g] 46 cm −1 (1.38 THz) interlayer shear mode of multilayer hexagonal BN, [10h] and 76 cm −1 (2.28 THz) zero-momentum mag-