X-Ray Spectra from H-, He- and Li-Like Iron Ions in a Vacuum Spark Plasma

Abstract

All the X-ray lines associated with K-shell from an iron plasma have been observed. Transition wavelengths of the He-like resonance series lines up to 1s6p-1s 2 have been determined for the first time. The structures of Kα He-like and Kβ Li-like satellites are described in detail. A highly resolved Kα spectrum of FeXXIV and FeXXV has been observed and the plasma parameters were defer-mined from the intensity ratios of intercombination line γ, dielectronic satellite j and satellite q due to inner-shell excitation to resonance line w and the line broadening of w , i.e., n e ≃10 21 cm -3 , T e ≃2.2 keV, the ionization temperature T z ≃0.8 keV and \(T_{i}\lesssim 4\) keV. These parameters show that the plasma is mainly under the transient ionizing condition. Comparison between the observed and calculated intensity ratios among the He-like resonance series lines in C–R model gives an evident proof for the ionizing plasma.