6533b83afe1ef96bd12a70ee
RESEARCH PRODUCT
Electron recombination with tungsten ions with open f-shells
V. A. DzubaC. HarabatiVictor V. FlambaumVictor V. FlambaumJulian C. Berengutsubject
PhysicsThermonuclear fusionAtomic Physics (physics.atom-ph)chemistry.chemical_elementFOS: Physical sciencesElectronPlasmaTungstenCondensed Matter Physics01 natural sciencesAtomic and Molecular Physics and Optics010305 fluids & plasmasIonPhysics - Atomic PhysicschemistryOrders of magnitude (time)0103 physical sciencesElectron temperatureAtomic physics010306 general physicsRecombinationdescription
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 modelling 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 have 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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2017-05-25 |