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Chin. Phys., 2004, Vol. 13(6): 891-897    DOI: 10.1088/1009-1963/13/6/019

Emission spectra simulation of calcium plasmas in non-local thermodynamic equilibrium

Liang Gui-Yun, Bian Xia, Zhao Gang
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
Abstract  We use previous high-quality experimental spectra to test the accuracy of atomic data and the validity of the collisional-radiative (CR) model used in this paper. The synthetic spectrum with electron temperature log T_e(K)=6.745 and electron density n_e=6.0×10^{13}cm^{-3}, which almost reproduces the experimental spectra, is presented. Nearly all the features of the experimental spectra were identified. The results of the CR modelling for the emission spectra of calcium plasmas all agree well with the measured spectral line intensities within the experimental error for most of the lines. Furthermore, we make the electron temperature diagnostic through the synthetic spectrum and population fractions of every ionization state as a function of charge state at different electron temperatures, as well as the electron density diagnostic through the intensity ratios of two lines of Be-like calcium and three lines of C-like calcium. A good agreement between the calculated values and the measured ones is found.
Keywords:  plasma      electron temperature and density diagnostic      atomic process      spectra  
Received:  19 August 2003      Revised:  07 January 2004      Published:  05 July 2005
PACS:  52.20.Hv (Atomic, molecular, ion, and heavy-particle collisions)  
  52.65.-y (Plasma simulation)  
  52.25.Jm (Ionization of plasmas)  
  52.25.Tx (Emission, absorption, and scattering of particles)  
  52.25.Kn (Thermodynamics of plasmas)  
Fund: Project supported by the Special Foundation for State Major Basic Research Programme of China (Grant No G1999075406) and the National Natural Science Foundation of China (Grant No 10373014).

Cite this article: 

Liang Gui-Yun, Bian Xia, Zhao Gang Emission spectra simulation of calcium plasmas in non-local thermodynamic equilibrium 2004 Chin. Phys. 13 891

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