Photodissociation and photoionization of molecules of astronomical interest: updates to the Leiden photodissociation & photoionization cross section database Helgi Hrodmarsson 2 and Ewine van Dishoeck 1 1 Leiden University, Netherlands and 2 LISA laboratory (Université Paris-Est Créteil), France The Leiden VUV cross section database has been updated with 14 new molecular species and 16 updates to previous entries. The database update is accompanied by a brief review of the basic physical processes, particularly toward photoionization processes which have not been reviewed in the context of previous database updates. 1-4 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/atom dependent, as well as the assumed dust absorbance. All the data are publicly available from the Leiden VUV cross section database. References 1. van Dishoeck, E. F. 1988, in Rate Coefficients in Astrochemistry 2. van Dishoeck, E. F., Jonkheid, B., & van Hemert, M. C. 2006, Faraday Discuss, 133, 231 3. van Dishoeck, E. F., & Visser, R. 2015, in Laboratory Astrochemistry: From Molecules through Nanoparticles to Grains 4. Heays, A. N., Bosman, A. D., & van Dishoeck, E. F. 2017, A&A, 602, A105
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