Raman spectrum of supercritical C18O2 and re-evaluation of the Fermi resonance
Abstract
We report the first Raman spectra of fully 18O-labeled supercritical CO2 (scCO2) and various isotopic mixtures. The experimental results, coupled with ab initio molecular dynamics calculations, demonstrate that the frequencies assigned to the Fermi dyad of the CO2 molecule transpose upon isotopic