Abstract
ABSTRACT Infrared spectra of chloroform samples in diamond anvil cells at ambient temperature and at pressures up to 10 GPa are reported. The freezing pressure is determined to be 0.76 GPa. All six fundamental vibrational modes and several combination modes are observed, with some exhibiting several components as a result of crystal field effects, and the dependence of their peak wavenumbers on pressure is presented. Some minor changes in the spectra near 6 GPa may be indicative of a structural phase transition, postulated from previous Raman studies. No color changes are observed over this pressure range and molecular distortion appears to be minimal, although there is evidence of a moderate increase in Cl-C-Cl bending forces. A metastable crystal is formed when the liquid is superpressed and flash-frozen, and its spectra suggest that this is characterized by molecular orientational disorder, similar to that found in crystalline bromoform.
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