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The effect of first order superconfiguration energies on the opacity of hot dense matter

HIGH ENERGY DENSITY PHYSICS 2015年 15卷 59-66页

作者： Krief, Menahem Feigel, Alexander Hebrew Univ Jerusalem Racah Inst Phys IL-91904 Jerusalem Israel Soreq NRC IL-81800 Yavne Israel

We have recently completed developing a new super transition array (STA) code for calculating absorption and emission spectra of LTE plasmas. The code follows the theory of Bar-Shalom et al. with various improvements. In this work we focus on the first order correction for the Boltzmann populations for which traditional calculations can be very costly. We present here a method faster by an order of magnitude than the traditional method. We then investigate the effect of this correction on the opacity spectra of several elements. Finally we interpret results of a recent opacity experiment on gold plasma. A good agreement is reached. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Opacity Gold opacity Unresolved transition array super transition array Configuration average energy First order superconfiguration average energy

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Variance and shift of transition arrays for electric and magnetic multipole transitions

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HIGH ENERGY DENSITY PHYSICS 2015年第PartB期17卷 254-262页

作者： Krief, Menahem Feigel, Alexander Hebrew Univ Jerusalem Racah Inst Phys IL-91904 Jerusalem Israel Soreq NRC IL-81800 Yavne Israel

Generalized analytical expressions for the two-electron relativistic Unresolved-transition-array (UTA) energy variance and shift for electric and magnetic transitions of general multipole order are presented. The revised expressions are shown to agree with the exact moments calculated directly from the energy levels of two-electron configurations. We show that for electric transitions of even multipole order and for magnetic transitions, the available expressions in the literature, which are implemented in widely used atomic codes, are incorrect. We suggest an alternative method for the calculation of the UTA energy variance and shift by using the analytical expressions for the two-electron energy levels and line-strengths. The method is much more efficient and simple than the use of the traditional lengthy analytic expressions. Finally, the effect of UTA widths on super-transition-array (STA) spectral opacity is shown for several examples. (C) 2015 Elsevier B.V. All rights reserved.

关键词： Atomic spectra Unresolved transition array UTA super transition array Multipole transitions Magnetic transitions

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