The electron energy-loss rate due to radiative recombination

Junjie Mao, Jelle Kaastra, N. R. Badnell

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For photoionized plasmas, electron energy-loss rates due to radiative recombination (RR) are required for thermal equilib- rium calculations, which assume a local balance between the energy gain and loss. While many calculations of total and/or partial RR rates are available from literature, specific calculations of associated RR electron energy-loss rates are lacking. Here we focus on electron energy-loss rates due to radiative recombination of H-like to Ne-like ions for all the elements up to and including zinc (Z = 30), over a wide temperature range. We use the AUTOSTRUCTURE code to calculate the level-resolved photoionization cross section and modify the ADASRR code so that we can simultaneously obtain level-resolved RR rate coefficients and associated RR electron energy-loss rate coefficients. The total RR rates and electron energy-loss rates of H i and He i are compared with those found in literature. Furthermore, we utilize and parameterize the weighted electron energy-loss factors (dimensionless) to characterize total electron energy-loss rates due to RR. The RR electron energy-loss data are archived according to the Atomic Data and Analysis Structure (ADAS) data class adf48. The RR electron energy-loss data are also incorporated into the SPEX code for detailed modelling of photoionized plamsas.
Original languageEnglish
Article numberA10
Number of pages8
JournalAstronomy and Astrophysics
Early online date20 Feb 2017
Publication statusE-pub ahead of print - 20 Feb 2017


  • astro-ph.HE
  • atomic data
  • atomic processes
  • radiative recombination
  • electron energy loss rate

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