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

- ca_18.elvlc (energy levels)
- ca_18.wgfa (radiative data)
- ca_18.scups (electron collision data)
- (proton collisional data) Not available in this VERSION.

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

%filename: ca_18.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 Autostructure calculation optimized with 'SHFTIC' file using energy corrections from the following sources: Observed bound energy levels: 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. observed(theoretical) energies for n=2 above IP Yerokhin, V. A.; Surzhykov, A., Physical Review A, vol. 86, Issue 4, id. 042507 Relativistic configuration-interaction calculation of energy levels of core-excited states in lithiumlike ions: Argon through krypton ADSref: http://adsabs.harvard.edu/abs/2012PhRvA..86d2507Y DOI: http://dx.doi.org/10.1103/PhysRevA.86.042507 Theoretical energies for n=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=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 July 21 ca_18 IP ev = 1.15776e+03 Ip invcm = 9338000.000 Ip Ryd = 85.09411 ca_19 IP ev = 5.12873e+03 Ip invcm = 41366000.000 Ip Ryd = 376.95472

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_18.wgfa Theoretical gf and A-values: Autostructure calculation 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 Autostructure calculation optimized with 'SHFTIC' file using energy corrections from the following sources: Observed bound energy levels: 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. observed(theoretical) energies for n=2 above IP Yerokhin, V. A.; Surzhykov, A., Physical Review A, vol. 86, Issue 4, id. 042507 Relativistic configuration-interaction calculation of energy levels of core-excited states in lithiumlike ions: Argon through krypton ADSref: http://adsabs.harvard.edu/abs/2012PhRvA..86d2507Y DOI: http://dx.doi.org/10.1103/PhysRevA.86.042507 Theoretical energies for n=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=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 levelsminimum branching ratio = 1.00e-04 allWvl = 1 minDiff = 0.00010 produced as a part of the 'CHIANTI' atomic database for astrophysical spectroscopy K. Dere (GMU) - 2017 July 21 %File processed with wgfa_tidy by pryoung on 6-Mar-2019 %File processed with wgfa_tidy by pryoung on 31-May-2023

contains the effective electron collision strengths scaled according to the rules formulated by Burgess and Tully (1992).

K. Dere (GMU) - 2017 June 16 produced as a part of the 'CHIANTI' atomic database for astrophysical spectroscopy collision strengths provided in the range 6.48e+04 to 6.48e+08 K BibCode: 2011A&A...528A..69L adsRef: http://adsabs.harvard.edu/abs/2011A%26A...528A..69L DOI: http://dx.doi.org/10.1051/0004-6361/201016417 Liang, G. Y.; Badnell, N. R. R-matrix electron-impact excitation data for the Li-like iso-electronic sequence including Auger and radiation damping theoretical collision strenghs: %filename: ca_18.scups

* Page created by Giulio Del Zanna on Mon Jun 26 11:14:47 2023*