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Bodewits, D.; Országh, J.; Noonan, J.; urian, M.; Matej ík, Š.
The Astrophysical journal, 11/2019, Letnik: 885, Številka: 2Journal Article
We studied the dissociation reactions of electron impact on water vapor for several fragment species at optical and near-ultraviolet wavelengths (200-850 nm). The resulting spectrum is dominated by the hydrogen Balmer series, by the OH (A 2 + − X 2 ) band, and by the emission of ionic H2O+(A 2A1 − X 2B1) and OH+(A 3 − X 3 −) band systems. Emission cross sections and reaction channel thresholds were determined for energies between 5 and 100 eV. We find that the electron impact dissociation of H2O results in an emission spectrum of the OH (A 2 + − X 2 ) band that is distinctly different from the emission spectra from other excitation mechanisms seen in planetary astronomy. We attribute the change to a strongly non-thermal population of rotational states seen in planetary astronomy. This difference can be utilized for remote probing of the contribution of different physical reactions in astrophysical environments.
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in: SICRIS
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