Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aps..dmp.d1108y&link_type=abstract
American Physical Society, 38th Annual Meeting of the Division of Atomic, Molecular, and Optical Physics, June 5-9, 2007, abstra
Physics
Scientific paper
Due to the astrophysical importance of water and helium, the H2O-He collisional system has been the subject of numerous experimental and theoretical studies. For numerical astrophysical models, quantitative determinations of state-to-state cross sections and rate coefficients for H2O-He collisions are crucial. In this work quantum close-coupling scattering calculations of rotational energy transfer (RET) of rotationally excited H2O due to collisions with He are presented for collision energies between 10-6 and 1000 cm-1 with para-H2O initially in levels 11,1, 20,2, 21,1, 22,0, and ortho-H2O in levels 11,0, 21,2, 22,1. Differential cross section, quenching cross sections and rate coefficients for state-to-state RET were computed on three new H2O-He potential energy surfaces (PESs). The inelastic and elastic differential cross sections are also compared with available experimental measurements.
Stancil Phillip
Yang Benhui
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