The CHIANTI database consists of the following primary ASCII files for this ion:

ca_16.elvlc (energy levels)

contains the energy levels in cm^(-1) It includes both experimental and theoretical values of the levels energies.

 
%observed energy levels (n=2): Edlen, B, 1983, Phys. Scripta, 28, 483
%observed energy levels (n=3): Martin,W.C., Sugar,J., Musgrove,A., Dalton,G.R., 1995, NIST Database Version 1.0
%Theoretical energy levels (n=2): Zhang, H.L., Graziani, M., Pradhan, A.K., 1994, A&A, 283, 319.
%theoretical energy levels (n=3): Sampson and Zhang, 1995, unpublished calculations
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere and E.Landi 1999
 

ca_16.wgfa (radiative data)

contains wavelengths, gf and A values of the transitions. The wavelengths are based on the experimental energy levels and should be the best available. Wavelengths calculated from the theoretical energies are of an indeterminate accuracy and their values are presented as negative values of the calculated wavelength.

 
%filename: ca_16.wgfa
%observed energy levels (n=2): Edlen, B, 1983, Phys. Scripta, 28, 483
%observed energy levels (n=3): Martin, W.C., Sugar, J., Musgrove, A., Dalton, G.R., 1995,
     NIST Database Version 1.0
%comment: theoretical wavelengths agree with NIST observed wavelength on the order of 1 - 10%
%oscillator strengths (n=3): Sampson and Zhang, 1995, unpublished calculations
%oscillator strengths (n=2): Dankwort,W., Trefftz,E., 1978, A&A, 65, 93.
%oscillator strengths (n=2): Bhatia,A.K., Feldman,U., Seely,J.F., 1986, ADNDT, 35, 319.
%A values (n=2): Dere,K.P., Mason,H.E., Widing,K.G., Bhatia,A.K., 1979, ApJS, 40, 364
%comment: gf and A values for transitions 123-71 and 124-72 are estimates
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% K.P.Dere and E.Landi 1999

ca_16.splups (electron collision data)

contains the spline fits to the electron collision strengths scaled according the rules formulated by Burgess and Tully (1992). Accurate replication of the temperature averaged collision strength over a wide range of temperatures can be accomplished with the data in this file.

 

%filename: ca_16.splups
%oscillator strengths: Dankwort, W., Trefftz, E., 1978, A&A, 65, 93
%collision strengths: Zhang, H.L., Graziani, M., Pradhan, A.K., 1994, A&A, 283, 319
% Comment: A small error was found in Zhang, H.L. et al 1994 upsilons, affecting
    upsilons for Al IX, Si X, S XII, Ar XIV, Ca XVI (and not lower-Z ions).
    The present data have been corrected by the authors.
% Comment: effective collision strengths were provided in the temperature range 4.35 < Log T < 7.05
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi - Aug 2001

ca_16.psplups (proton collision data)

contains the spline fits to the scaled proton collision strengths.

 

%filename: ca_16.psplups
%rates: Foster VJ, Keenan FP, Reid RHG, ADNDT 67, 99, 1997
%energies: From .elvlc file, experimental energies
%comment: The rate coefficients are in units cm^3/s.
%comment: Fits valid for temperatures 6e5 to 2e7 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   15-May-2001

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The html tables below contain the radiative data of the brightest lines sorted in wavelength

ca_16_table1.html (html table -- 18.7622 -- 22.9675 A)

ca_16_table2.html (html table -- 22.9715 -- 2731.4246 A)


Last revised by G. Del Zanna on 4-Sep-2009