Collisional excitation of water by hydrogen atoms. Issue 3 (24th November 2014)

• Record Type: Journal Article
• Authors: Daniel, F.; Faure, A.; Dagdigian, P. J.; Dubernet, M.-L.; Lique, F.; Forêts, G. Pineau des
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 446:Issue 3(2015)
• Page Start: 2312
• Page End: 2316
• Publication Date: 2014-11-24
• Subjects: molecular data -- molecular processes -- scattering; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/stu2287
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: We present quantum dynamical calculations that describe the rotational excitation of H2 O due to collisions with H atoms. We used a recent, high-accuracy potential energy surface, and solved the collisional dynamics with the close-coupling formalism, for total energies up to 12 000 cm −1 . From these calculations, we obtained collisional rate coefficients for the first 45 energy levels of both ortho- and para-H2 O and for temperatures in the range T = 5–1500 K. These rate coefficients are subsequently compared to the values previously published for the H2 O/He and H2 O/H2 collisional systems. It is shown that no simple relation exists between the three systems and that specific calculations are thus mandatory.