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Astronomy and astrophysics (Berlin), 2023-06, Vol.675
2023
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Autor(en) / Beteiligte
Titel
Photodissociation and photoionization of molecules of astronomical interest
Ist Teil von
  • Astronomy and astrophysics (Berlin), 2023-06, Vol.675
Ort / Verlag
EDP Sciences
Erscheinungsjahr
2023
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
  • Context. Vacuum-ultraviolet (VUV) photons are important drivers of chemical processes in space. Thus, it is important to accurately characterize and constrain photorates in different radiation fields, via the photodissociation and photoionization cross sections of individual atoms and molecules. These have been available in the Leiden VUV photodissocation and photoionization cross section database. Aims. Experimental and theoretical advances in the past decade or so have allowed multiple new cross sections to be obtained, particularly photoionization cross sections of radicals. The database is hereby updated by including these more recent cross sections and is also expanded with several astronomically relevant species. Methods. The cross sections have been used to calculate photodissociation and photoionization rates in several different radiation fields as well as from cosmic-ray-induced VUV fluxes. The reduction of rates in shielded regions was calculated as a function of dust, molecular and atomic hydrogen, atomic carbon, and self-shielding column densities. The relative importance of these shielding types is molecule and atom dependent, as well as the assumed dust absorbance. All the data are publicly available from the Leiden VUV cross section database. Results. The Leiden VUV cross section database has been updated with 14 new astrophysically relevant molecular species and 16 updates to previous entries. The database update is accompanied by a brief review of the basic physical processes, particularly photoionization processes which have not been reviewed in the context of previous database updates.
Sprache
Englisch
Identifikatoren
ISSN: 0004-6361
eISSN: 1432-0756
DOI: 10.1051/0004-6361/202346645
Titel-ID: cdi_hal_primary_oai_HAL_hal_04568712v1
Format
Schlagworte
Sciences of the Universe

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