%0 Journal Article %T On the importance of full-dimensionality in low-energy molecular scattering calculations %+ Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) %+ Université de Bordeaux (UB) %A Faure, Alexandre %A Jankowski, Piotr %A Stoecklin, Thierry %A Szalewicz, Krzysztof %< avec comité de lecture %@ 2045-2322 %J Scientific Reports %I Nature Publishing Group %V 6 %8 2016 %D 2016 %Z 2016NatSR...628449F %R 10.1038/srep28449 %Z Sciences of the Universe [physics]Journal articles %X Scattering of H2 on CO is of great importance in astrophysics and also is a benchmark system for comparing theory to experiment. We present here a new 6-dimensional potential energy surface for the ground electronic state of H2-CO with an estimated uncertainty of about 0.6 cm-1 in the global minimum region, several times smaller than achieved earlier. This potential has been used in nearly exact 6-dimensional quantum scattering calculations to compute state-to-state cross-sections measured in low-energy crossed-beam experiments. Excellent agreement between theory and experiment has been achieved in all cases. We also show that the fully 6-dimensional approach is not needed with the current accuracy of experimental data since an equally good agreement with experiment was obtained using only a 4-dimensional treatment, which validates the rigid-rotor approach widely used in scattering calculations. This finding, which disagrees with some literature statements, is important since for larger systems full-dimensional scattering calculations are currently not possible. %G English %2 https://insu.hal.science/insu-03691535/document %2 https://insu.hal.science/insu-03691535/file/srep28449.pdf %L insu-03691535 %U https://insu.hal.science/insu-03691535 %~ INSU %~ UNIV-SAVOIE %~ UGA %~ CNRS %~ INPG %~ IRSTEA %~ CNES %~ OSUG %~ IPAG %~ AGREENIUM %~ INRAE %~ UGA-COMUE %~ USMB-COMUE