The progress on high resolution spectra measurements of van der Waals complexes water-CO2 in the second water overtone range

Water and CO2 are the most important greenhouse gases in our atmosphere. The solvation of CO2 is a decisive process in the chemistry of clouds and oceans. A precise characterization of the interaction of these two molecules is thus of prime importance. In the present work, we recorded the set of rotationally resolved spectra associated to the multiple excitation of the OH/OD stretch in the water–CO2 molecular complex. This represents a further step in our longstanding effort to better characterize the dynamics of the interaction of CO2 and H2O notably through a systematic increase of the vibrational excitation (1,2,3). All the measurements were performed using the FANTASIO experimental setup (4,5). The complexes were formed using an 8 cm long pulsed slit supersonic jet and probed using the CRDS technique in the spectral range of the second overtone of water. The experimental spectra, the assignment, and the improvements of the experimental setup, which allowed the recording of this spectral signature, will be presented. 1. C. Lauzin, et al., Mol. Phys. 118, e1706776 (2020). 2. A.S. Bogomolov,et al., Chem. Phys. Lett. 774, 138606 (2021). 3. T. Gartner, et al., J. Phys. Chem. A 127,3668 (2023). 4. M. Herman,et al., Mol. Phys. 105, 815 (2007). 5. A.S. Bogomolov, et al., Mol. Phys. 123, e2413417 (2024).