The Raman spectrum of gallium metal

Whereas metallic elements with the fee, hcp and bce structures have no Rama n-active vibrations, solid gallium is found to have one Raman band at 246 c m(-1). This band is not observed for molten gallium, and it is attributed t o the symmetric stretching vibration of the two Ga, units in the primitive unit cell. Since solid gallium has Raman-active vibrational modes and has a lready been reported to exhibit SERS, it should also exhibit plasma resonan ce enhancement of the Raman scattering by the metal itself, a phenomenon wh ich has not yet been observed experimentally. (C) 2000 Elsevier Science B.V . All rights reserved.