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[en] Highlights: • Raman spectral change of CO2 induced by absorption into an ionic liquid was studied. • Band shift and bandwidth broadening in the Fermi dyad were clarified. • Differences between neat and absorbed CO2 were discussed continuously up to 15 MPa. • Little pressure dependences for the absorbed CO2 were surprisingly clarified. • Vibration of the CO2 is intensively perturbed than that for neat supercritical CO2. • Vibration of the CO2 molecules is stabilized by surrounding ionic liquid. Raman spectral changes of CO2 induced by the absorption were evaluated for the Fermi dyad continuously up to 15 MPa of equilibrium CO2 pressure. Little pressure dependence was observed for both the band positions and the bandwidth of the absorbed CO2, compared to those for neat supercritical CO2. Furthermore, the band positions lay at much lower values than those for neat CO2. The bandwidth broadening was observed for the absorbed CO2 even in the lower pressure region. The absorption state of CO2 is discussed from the viewpoints of structural fluctuations and interaction forces induced by the surrounding ionic liquid.