Opened 4 years ago

## #290 new enhancement

# atomic data for Be seq

Reported by: | Gary J. Ferland | Owned by: | nobody |
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Priority: | good to do | Milestone: | |

Component: | atomic/molecular data base | Version: | trunk |

Keywords: | Cc: |

### Description

Title: R-matrix electron-impact excitation data for the Be-like iso-electronic sequence Authors: Fernández-Menchero, L.; Del Zanna, G.; Badnell, N. R. Affiliation: AA(Department of PhysicsUniversity of Strathclyde, Glasgow, G4 0NG, UK luis.fernandez-menchero@strath.ac.uk ), AB(Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Cambridge, CB3 0WA, UK), AC(Department of PhysicsUniversity of Strathclyde, Glasgow, G4 0NG, UK luis.fernandez-menchero@strath.ac.uk ) Publication: Astronomy & Astrophysics, Volume 566, id.A104, 11 pp. (A&A Homepage) Publication Date: 06/2014 Origin: EDP Sciences Astronomy Keywords: atomic data, techniques: spectroscopic DOI: 10.1051/0004-6361/201423864 Bibliographic Code: 2014A&A...566A.104F Abstract Aims: Emission lines from ions in the Be-like isoelectronic sequence can be used for reliable diagnostics of temperature and density of astrophysical and fusion plasmas over a wide range of temperatures. Surprisingly, interpolated data is all that is available for a number of astrophysically important ions. Methods: We have carried out intermediate coupling frame transformation R-matrix calculations which include a total of 238 fine-structure levels in both the configuration interaction target and close-coupling collision expansions. These arise from the configurations 1s2 2 {s, p} nl with n = 3-7, and l = 0-4 for n ? 5 and l = 0-2 for n = 6,7. Results: We obtain ordinary collision strengths and Maxwell-averaged effective collision strengths for the electron-impact excitation of all the ions of the Be-like sequence, from B+ to Zn26+. We compare with previous R-matrix calculations and interpolated values for some benchmark ions. We find good agreement for transitions n = 2-2 with previous R- matrix calculations but some disagreements with interpolated values. We also find good agreement for the most intense transitions n = 2-3 which contribute via cascade to the (n = 2) diagnostic radiating levels. These data are made available in the archives of APAP via http://www.apap-network.org and OPEN-ADAS via http://open.adas.ac.uk

GJF: Collision rates for some C III lines differ by 2x from previous work.

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