Infrared absorption spectroscopy of polycarbonate at high pressure

High‐pressure Fourier‐transform infrared absorption spectroscopy has been performed on polycarbonate, using a diamond anvil cell to produce pressures up to ∼6 GPa. The frequencies of the vibrational modes have been measured as a function of pressure. Individual mode Grüneisen parameters have been determined for six vibrational modes. The data were fit to models that included both volume‐dependent and ‐independent Grüneisen parameters. The vibrational frequency shifts as a function of pressure have been found to be consistent with those measured for similar types of bonds in other molecules.