Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jchph.133m1103y&link_type=abstract
Journal of Chemical Physics, Volume 133, Issue 13, pp. 131103-131103-4 (2010).
Astronomy and Astrophysics
Astronomy
8
Astronomy, Atom-Molecule Collisions, Helium Neutral Atoms, Hydrogen Neutral Molecules, Molecule-Molecule Collisions, Potential Energy Surfaces, Water, Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Interatomic And Intermolecular Potentials And Forces, Potential Energy Surfaces For Collisions
Scientific paper
We report a joint experimental and theoretical study that directly tests the quality of the potential energy surfaces used to calculate energy changing cross sections of water in collision with helium and molecular hydrogen, at conditions relevant for astrophysics. Fully state-to-state differential cross sections are measured for H2O-He and H2O-H2 collisions at 429 and 575 cm-1 collision energy, respectively. We compare these differential cross sections with theoretical ones for H2O+H2 derived from state-of-the-art potential energy surfaces [P. Valiron et al., J. Chem. Phys. 129, 134306 (2008)] and quantum scattering calculations. This detailed comparison forms a stringent test of the validity of astrophysics calculations for energy changing rates in water. The agreement between theory and experiment is striking for most of the state-to-state differential cross sections measured.
Faure Alex
Feautrier N.
McBane G. C.
Parker David H.
Sarma Gopal
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