Satellite lines have been used to determine electron temperature with the use of the intensity ratios to the resonance line in various plasmas. In order to diagnose precisely, atomic data, wavelength, radiative transition rate, and autoionization rate, have been calculated. Most of the atomic data on autoionizing states of helium-like ions have been calculated by Vainshtein and Safronova [1]. In this paper we have developed a new method to diagnose plasma temperature and density only using satellite lines since Lyα lines are easily affected by opacity. Atomic data of helium-like magnesium ions are calculated by the following codes and compared with each other:(1) MZ code by Vainshtein and Safronova [1], (2) a code based on many-body theory by Safronova [2], (3) a code based on many-body theory by Lindroth [3], (4) Hullac code [4], (5) Cowan code, and other published data. Atomic data for autoionizing states 2lnl with n = 2 and 3 agree rather well within 20% for the data (1), (2), and (3). However autoionization rates from 2p4f ³D_1,2,3 state to 1s state of the data (1) are larger by 1 ~ 4 order of magnitude than the data of (2) and (3). Autoionization rates for several states with n = 4 and 5 by (1) are larger than those by other codes. While radiative transition rates between different codes agree well. Satellite line spectra of He-like Mg ions from laser-produced plasma were observed with high resolution spectrometer [5]. Theoretical spectra using different atomic data sets are compared with observed satellite line spectra. We have derived the electron temperature and density from satellite intensity ratios.

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