atomic data for Be seq (trac #290)

reported by: @CloudyLex

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.

Migrated from https://www.nublado.org/ticket/290

{
    "status": "new",
    "changetime": "2019-02-04T13:07:06Z",
    "_ts": "1549285626580696",
    "description": "{{{\nTitle:\t\nR-matrix electron-impact excitation data for the Be-like iso-electronic sequence\nAuthors:\t\nFern\u00e1ndez-Menchero, L.; Del Zanna, G.; Badnell, N. R.\nAffiliation:\t\nAA(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 )\nPublication:\t\nAstronomy & Astrophysics, Volume 566, id.A104, 11 pp. (A&A Homepage)\nPublication Date:\t\n06/2014\nOrigin:\t\nEDP Sciences\nAstronomy Keywords:\t\natomic data, techniques: spectroscopic\nDOI:\t\n10.1051/0004-6361/201423864\nBibliographic Code:\t\n2014A&A...566A.104F\nAbstract\n\n\nAims: Emission lines from ions in the Be-like isoelectronic sequence can be used for \nreliable diagnostics of temperature and density of astrophysical and fusion plasmas over a \nwide range of temperatures. Surprisingly, interpolated data is all that is available for a \nnumber of astrophysically important ions. \n\nMethods: We have carried out intermediate coupling frame transformation R-matrix \ncalculations which include a total of 238 fine-structure levels in both the configuration \ninteraction target and close-coupling collision expansions. These arise from the \nconfigurations 1s2 2 {s, p} nl with n = 3-7, and l = 0-4 for n ? 5 and l = 0-2 for n = 6,7. \n\nResults: We obtain ordinary collision strengths and Maxwell-averaged effective collision \nstrengths for the electron-impact excitation of all the ions of the Be-like sequence, from \nB+ to Zn26+. We compare with previous R-matrix calculations and interpolated values for \nsome benchmark ions. We find good agreement for transitions n = 2-2 with previous R-\nmatrix calculations but some disagreements with interpolated values. We also find good \nagreement for the most intense transitions n = 2-3 which contribute via cascade to the (n \n= 2) diagnostic radiating levels.\n\nThese data are made available in the archives of APAP via http://www.apap-network.org \nand OPEN-ADAS via http://open.adas.ac.uk\n}}}\n\nGJF:  Collision rates for some C III lines differ by 2x from previous work.",
    "reporter": "gary",
    "cc": "",
    "resolution": "",
    "time": "2014-06-24T16:01:33Z",
    "component": "atomic/molecular data base",
    "summary": "atomic data for Be seq",
    "priority": "good to do",
    "keywords": "",
    "version": "trunk",
    "milestone": "no milestone",
    "owner": "nobody",
    "type": "enhancement"
}

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atomic data for Be seq (trac #290) #292