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Spectra of water-CO2 dimers are studied using a tunable mid-infrared sourceto probe a pulsed slit jet supersonic expansion. H2O-CO2 and D2O-CO2 areobserved in the CO2 nu3 fundamental region (~2350 cm-1), D2O-CO2 is alsoobserved in the D2O nu3 fundamental region (~2790 cm-1), and HDO-CO2 isobserved in the HDO O-D stretch fundamental region (~2720 cm-1), all for thefirst time in these regions. Analysis of the spectra yields excited staterotational parameters and vibrational shifts. They also yield the firstexperimental values of the ground state internal rotation tunneling splittingsfor D2O-CO2 (0.003 cm-1) and HDO-CO2 (0.0234 cm-1). The latter value is adirect determination made possible by the reduced symmetry of HDO-CO2. Theseresults provide stringent and easily interpreted tests for theoretical water -CO2 potential energy surface calculations.

Infrared spectra of the water-CO2 complex in the 4.3-3.6 micron region and determination of the ground state tunneling splitting for HDO-CO2