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Atoms 2015, 3(2), 86-119; doi:10.3390/atoms3020086

Radiative Recombination and Photoionization Data for Tungsten Ions. Electron Structure of Ions in Plasmas

1
Petersburg Nuclear Physics Institute, Gatchina, Leningrad District, 188300, Russia
2
Ioffe Physical Technical Institute, St. Petersburg 194021, Russia
*
Author to whom correspondence should be addressed.
Academic Editors: Alfred Müller and Bastiaan J. Braams
Received: 24 February 2015 / Revised: 1 May 2015 / Accepted: 6 May 2015 / Published: 18 May 2015
(This article belongs to the Special Issue Atomic Data for Tungsten)
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Abstract

Theoretical studies of tungsten ions in plasmas are presented. New calculations of the radiative recombination and photoionization cross-sections, as well as radiative recombination and radiated power loss rate coefficients have been performed for 54 tungsten ions for the range W6+–W71+. The data are of importance for fusion investigations at the reactor ITER, as well as devices ASDEX Upgrade and EBIT. Calculations are fully relativistic. Electron wave functions are found by the Dirac–Fock method with proper consideration of the electron exchange. All significant multipoles of the radiative field are taken into account. The radiative recombination rates and the radiated power loss rates are determined provided the continuum electron velocity is described by the relativistic Maxwell–Jüttner distribution. The impact of the core electron polarization on the radiative recombination cross-section is estimated for the Ne-like iron ion and for highly-charged tungsten ions within an analytical approximation using the Dirac–Fock electron wave functions. The effect is shown to enhance the radiative recombination cross-sections by ≲20%. The enhancement depends on the photon energy, the principal quantum number of polarized shells and the ion charge. The influence of plasma temperature and density on the electron structure of ions in local thermodynamic equilibrium plasmas is investigated. Results for the iron and uranium ions in dense plasmas are in good agreement with previous calculations. New calculations were performed for the tungsten ion in dense plasmas on the basis of the average-atom model, as well as for the impurity tungsten ion in fusion plasmas using the non-linear self-consistent field screening model. The temperature and density dependence of the ion charge, level energies and populations are considered. View Full-Text
Keywords: radiative recombination; photoionization; rate coefficient; Dirac–Fock method; tungsten ion; polarization effect; density; temperature radiative recombination; photoionization; rate coefficient; Dirac–Fock method; tungsten ion; polarization effect; density; temperature
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Trzhaskovskaya, M.B.; Nikulin, V.K. Radiative Recombination and Photoionization Data for Tungsten Ions. Electron Structure of Ions in Plasmas. Atoms 2015, 3, 86-119.

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