Agence Nationale de la Recherche
Programme : Blanc SIMI 5

Hydrides play a central role in molecular astrophysics as significant reservoirs of heavy elements. Excitation studies of interstellar hydrides deserve a particular attention because the reactive processes with H and H2, negligible at low temperature for most of the molecules, can compete with or even dominate the energy transfer processes. The objective of the present cross-disciplinary project is to address this challenging problem both theoretically and experimentally. The main targeted species are carbon, nitrogen and oxygen hydrides (CH+, NH, OH+, etc.), which are the building blocks of the whole interstellar chemistry. In addition to the production of fundamental molecular data, the analysis of available astronomical spectra (e.g. from Herschel telescope) will be carried out through coupled radiative transfer and chemical models. Such studies have been so far hampered by the lack of accurate state-to-state collisional cross sections and rate coefficients for the relevant species. A strong impact of the present proposal is thus expected both in molecular sciences and in astrochemistry.

The project officially started on 1st january 2013 and ended in december 2017.

The final report of the ANR project can be found here (february 2018)
New article on the water-hydrogen collisions (accepted 08/07/2019)

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