High-pressure studies of solid iodine by Raman spectroscopy

Raman spectra of solid iodine were measured up to 26.8 GPa. New bands observed above 10 GPa are discussed within the framework of a previously suggested quasi-one-dimensional molecular phase existing prior to molecular dissociation. Higher-order spectra due to two- and three-phonon processes were observed up to 10 GPa, and provide information on the pressure dependence of phonon states near the edge of the Brillouin zone.