We report the observation of the high resolution (0.008 cm^-1) infrared absorption spectra of CO₂ molecules isolated in solid parahydrogen (pH₂) matrices at T = 2.4 to 4.8 K. Several extremely sharp (0.01 to 0.04 cm^-1 full-width-at-half-maximum) absorption features appear in the 2343.5 to 2345 cm^-1 region. We assign the three strongest peaks to the nu₃ mode of isolated CO₂ molecules. The spectra are consistent with trapping of the CO₂ molecules in three distinct double-substitutional sites in hcp and fcc regions of the pH₂ solid. We offer several hypotheses as to the origins of the numerious weaker absorption features.

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