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Raman scattering measurements of an iodine-doped I 8 Si 44 I 2 clathrate have been performed at pressures up to 28 GPa and 296 K. We found two Raman peaks at 75 and 101 cm Ϫ1 associated with the vibrations of guest I atoms inside the host Si cages, and observed some framework vibrations around 120-500 cm Ϫ1 . These characteristic Raman bands and their pressure dependence are investigated in consideration of our recent Ba 8 Si 46 studies. The lowest-frequency framework vibration at 133 cm Ϫ1doi:10.1103/physrevb.68.212102 fatcat:j2l54aun4bc5djx47ejpaz2eay