CHIANTI

An Atomic Database for Spectroscopic Diagnostics of Astrophysical Plasmas.

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Naval Research Laboratory (USA) - Rutherford Appleton Laboratory (UK)
University of Cambridge (UK) - George Mason University (USA) - Universita' degli Studi di Firenze (Italy)

Cr XVII - VERSION 4.2

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

  1. cr_17.elvlc (energy levels)

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

     
%experimental energy levels: Edlen, B., 1983, Phys. Scr., 28, 51
%theoretical energy levels ground conf: Galavis etal, 1997, AASS, 123, 159
%theoretical energy levels excited conf: extrapolated using Al VI to Fe XIX data.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi 1997

  2. cr_17.wgfa (radiative data)

    3. 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. 

     
%observed energy levels: Edlen, B., 1983, Phys. Scr., 28, 51
% Radiative transition probabilities ground conf.: Galavis etal, 1997, AASS, 123, 159
% Radiative transition probabilities allowed trans.: Fawcett, B., 1986, ADNDT, 34, 215
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi 1997

  3. cr_17.splups (electron collision data)

    4. 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: cr_17.splups
%oscillator strengths: interpolated using Al VI to Fe XIX data
%effective collision strengths: interpolated using Al VI to Fe XIX data
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Enrico Landi 1997

  4. cr_17.psplups (proton collision data)

    5. contains the spline fits to the scaled proton collision strengths. 

     

%filename: cr_17.psplups
%rates: Ryans R.S.I., Keenan F.P., Reid R.H.G., unpublished.
%energies: Observed values, from .elvlc file
%comment: Fits valid for temperatures 1.25e6 to 1.75e7 K.
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
% Peter Young   15-May-2001

    The html table below contains the radiative data of the brightest lines sorted in wavelength

    cr_17_table.html (html table)


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