Electron recombination with tungsten ions with open f-shells. (25th May 2017)

• Record Type: Journal Article
• Authors: Harabati, C; Berengut, J C; Flambaum, V V; Dzuba, V A
• Is Part Of: Journal of physics. Volume 50:Number 12(2017:Jun. 15)
• Publication Date: 2017-05-25
• Subjects: atomic structure -- electron recombination -- resonance scattering; 34.80Lx -- 31.10.+z -- 34.10.+x; Atoms -- Periodicals; Molecules -- Periodicals; Optics -- Periodicals; Nuclear physics -- Periodicals; 539.6
• DOI: 10.1088/1361-6455/aa6cd1
• Languages: English
• ISSNs: 0953-4075

Abstract

Abstract: We calculate the electron recombination rates with target ions W q +, q = 18–25, as functions of electron energy and electron temperature (i.e. the rates integrated over the Maxwellian velocity distribution). Comparison with available experimental data for W 18 +, W 19 +, and W 20 + is used as a test of our calculations. Our predictions for W 21 +, W 22 +, W 23 +, W 24 +, and W 25 + (where the experimental data are not available) may be used for plasma modeling in thermonuclear reactors. The results for the temperature-dependent rates for each ion are fitted with the standard analytical expressions to make them easy to use. All of these ions have an open electron f -shell and an extremely dense spectrum of chaotic many-electron compound resonances, which enhance the recombination rates by 2–3 orders of magnitude in comparison with the direct electron recombination. Conventional dielectronic recombination theory is not directly applicable in this case. Instead, we developed a statistical theory based on the properties of chaotic eigenstates. This theory describes a multi-electronic recombination (extension of the dielectronic recombination) via many-excited-electron compound resonances.