Ne VIII - VERSION 10.1


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

  1. ne_8.elvlc (energy levels)
  2. contains the energy levels (in cm-1). It includes both experimental and theoretical values of the levels energies.

     
    %filename:  ne_8.elvlc
    Theoretical energy levels:
    Autostructure calculation with energy levels optimized to match to the observed energies
    A Breit-Pauli distorted wave implementation for AUTOSTRUCTURE
    Badnell, N.R., 2011, Computer Physics Communications, 182, 1528
    ADSref:  http://adsabs.harvard.edu/abs/2011CoPhC.182.1528B
    
    optimization by means of AS SHFTIC file with corrections from the following data
    
    % energies for 2s2.2p levels:  Sapirstein, J.,  Cheng,  K.,  2011, Phys. Rev. A,  83,  012504
    S-matrix calculations of energy levels of the lithium isoelectronic sequence
    ADSref:  http://adsabs.harvard.edu/abs/2011PhRvA..83a2504S
    these give an energy for level 3 that is commensurate with the wavelength of 770.428+/0.007 of 
    Peter & Judge, 1999, ApJ, 522,1148 
    adsRef:  http://adsabs.harvard.edu/abs/1999ApJ...522.1148P
    and Dammasch et al. 1999, A&A, 346,285.
    adsRef:  http://adsabs.harvard.edu/abs/1999A%26A...346..285D
    the observed value of level 3 is derived from these experimental measurements
    
    Observed bound energy levels n=2, 3, 4, 5, 6, 7 and above the IP, n=2,3 :
    Kramida, A. E.; Buchet-Poulizac, M.-C.,
    Energy levels and spectral lines of Ne VIII
    ADSref:  http://adsabs.harvard.edu/abs/2006EPJD...39..173K
    DOI:  10.1140/epjd/e2006-00122-3
    Bibcode:  2006EPJD...39..173K
    also in:
    Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2012).
    NIST Atomic Spectra Database (ver. 5.0), [Online].
    Available: http://physics.nist.gov/asd [2012, September 14].
    National Institute of Standards and Technology, Gaithersburg, MD.
    
    Theoretical energies for n=2, 3 above IP
    Goryaev, F. F.; Vainshtein, L. A.; Urnov, A. M.
    Atomic data for doubly-excited states 2ln of He-like ions and 1s2lnl of Li-like ions with Z = 6-36 and n = 2 , 3
    2017, ADNDT, 113, 117-257
    adsRef:  http://adsabs.harvard.edu/abs/2017ADNDT.113..117G
    DOI:  10.1016/j.adt.2016.04.002
    
    theoretical energy levels (n=4, 5 above IP):
    calculations of U. Safronova reported in Kato et al., 1997, ADNDT, 67, 225.
    ADS http://adsabs.harvard.edu/abs/1997ADNDT..67..225K
    updated by U. Safronova, 2001, private communication
    
    produced as a part of the 'CHIANTI' atomic database for astrophysical spectroscopy
     K. Dere (GMU) - 2017 August 04
    
    
     
    

  3. ne_8.wgfa (radiative data)
  4. 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:  ne_8.wgfa
    
    theoretical gf and A-values:  
    Optimized Autostructure calculation
    A Breit-Pauli distorted wave implementation for AUTOSTRUCTURE
    Badnell, N.R., 2011, Computer Physics Communications, 182, 1528
    ADSref:  http://adsabs.harvard.edu/abs/2011CoPhC.182.1528B
    
    optimization by means of AS SHFTIC file with corrections from the following data
    
    Observed bound energy levels n=2, 3, 4, 5, 6, 7 and above the IP, n=2 :
    Kramida, A. E.; Buchet-Poulizac, M.-C.,
    Energy levels and spectral lines of Ne VIII
    ADSref:  http://adsabs.harvard.edu/abs/2006EPJD...39..173K
    DOI:  10.1140/epjd/e2006-00122-3
    Bibcode:  2006EPJD...39..173K
    
    also in:
    Kramida, A., Ralchenko, Yu., Reader, J., and NIST ASD Team (2012).
    NIST Atomic Spectra Database (ver. 5.0), [Online].
    Available: http://physics.nist.gov/asd [2012, September 14].
    National Institute of Standards and Technology, Gaithersburg, MD.
    
    Theoretical energies for n=2, 3 above IP
    Goryaev, F. F.; Vainshtein, L. A.; Urnov, A. M.
    Atomic data for doubly-excited states 2lnl of He-like ions and 1s2lnl of Li-like ions with Z = 6-36 and n = 2 , 3
    2017, ADNDT, 113, 117-257
    adsRef:  http://adsabs.harvard.edu/abs/2017ADNDT.113..117G
    DOI:  10.1016/j.adt.2016.04.002
    
    theoretical energy levels (n=3,4,5 above IP):
    calculations of U. Safronova reported in Kato et al., 1997, ADNDT, 67, 225.
    ADS http://adsabs.harvard.edu/abs/1997ADNDT..67..225K
    updated by U. Safronova, 2001, private communication
    
    wavelengths determined from energy levels
    minimum branching ratio =   1.00e-04
    
     allWvl =   1
     minDiff =      0.00010
     outfile = ne_8.wgfa.olg.imp
    produced as a part of the 'CHIANTI' atomic database for astrophysical spectroscopy
     K. Dere (GMU) - 2017 August 04
    %File processed with wgfa_tidy by pryoung on  6-Mar-2019
    %File processed with wgfa_tidy by pryoung on 31-May-2023
    

  5. ne_8.scups (electron collision data)
  6. contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

     
     K. Dere (GMU) - 2012 December 23
    produced as a part of the 'CHIANTI' atomic database for astrophysical spectroscopy
    
    collision strengths provided in the range   1.28e+04 to   1.28e+08 K
    
    ADS ref:  https://ui.adsabs.harvard.edu/abs/2011A%26A...528A..69L/abstract
    DOI:  https://ui.adsabs.harvard.edu/link_gateway/2011A&A...528A..69L/doi:10.1051/0004-6361/201016417
    Astronomy & Astrophysics, Volume 528, id.A69, 15 pp
    including Auger and radiation damping
    R-matrix electron-impact excitation data for the Li-like iso-electronic sequence
    Liang, G. Y.; Badnell, N. R.
    Theoretical collision strengths:
    
    
    %filename:  ne_8.scups
    

  7. (proton collisional data) Not available in this VERSION.

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

    ne_8_table.html (html table)

    Page created by Giulio Del Zanna on Mon Jun 26 11:18:05 2023