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)

He II - VERSION 6.0

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

  1. he_2.elvlc (energy levels)

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

     
%observed energy levels: Kelly, R.L., 1987, J.Phys.Chem.Ref.Data 16, Suppl. 1
%theoretical energy levels:  Connor Ballance (private communications)
%comment: An R-matrix with pseudostates He^+ calculation   1s-5g
     Degenerate transitions removed within LS coupling scheme

  2. he_2.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. 

     
%filename: he_2.wgfa
%observed energy levels: Kelly, R.L., 1987, J.Phys.Chem.Ref.Data 16, Suppl. 1.     
% A values: Parpia, F.A., Johnson, W.R., 1972, Phys.Rev.A, 26, 1142.
%oscillator strengths: Wiese, W.L., Smith, M.W., Glennon, B.M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4.
%note: Wiese's oscillator strengths are hydrogenic
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data base collaboration
%
%   K.P.Dere 1995

  3. he_2.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: he_2.splups
%theoretical energy levels:  Connor Ballance (private communications)
%oscillator strengths:  Wiese, W. L., Smith, M. W., and Glennon, B. M., 1966, Atomic Transition Probabilities, NSRDS-NBS-4.
%comment:  hydrogenic f values
%collision strengths:  Connor Ballance (private communications)
%comment: An R-matrix with pseudostates He^+ calculation   1s-5g
     Degenerate transitions removed within LS coupling scheme

     L=0-11     exchange calculation
     L=12-60    non-exchange calculation + top up

     (Connor Ballance - 28th June 2003)
     Degenerate transitions removed within LS coupling scheme
    1    9     3.556 1.160e+04 2.320e+04 5.800e+04 8.120e+04 1.160e+05 2.320e+05 3.480e+05 5.800e+05 1.000e+06
    1    9-2.034e-02 2.466e-02 2.334e-02 2.058e-02 1.962e-02 1.878e-02 1.764e-02 1.728e-02 1.716e-02 1.734e-02
    1   10     3.750 1.160e+04 2.320e+04 5.800e+04 8.120e+04 1.160e+05 2.320e+05 3.480e+05 5.800e+05 1.000e+06
%produced as part of the Arcetri/Cambridge/NRL 'CHIANTI' atomic data collaboration
%
% K.P.Dere - Jul 2, 2003

  4. he_2.splups (proton collisional data) Not available in this VERSION.

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

    he_2_table.html (html table)


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