Influence of Magnetic Fields on Recombination Rates of Au25+

Hoffknecht, A.; Uwira, O.; Schennach, S.; Frank, A.; Haselbauer, J.; Spies, W.; Angert, N.; Mokler, P. H.; Becker, R.; Kleinod, M.; Schippers, S.; Müller, A.

doi:10.1238/physica.topical.080a00316

Cited by 5 publications

(10 citation statements)

References 2 publications

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“…Use of a statistical description of the compound resonances resolved the discrepancy [11,18]. A similar enhancement of the recombination due to compound resonances was found earlier in the isoelectric ion Au 25+ [19] and explained by the statistical theory [5].…”

Section: Introductionsupporting

confidence: 77%

Section: Theorymentioning

confidence: 66%

“…Experiment shows that the recombination rates at low (∼ 1 eV) electron energies in these ions exceed the direct RR rates by two orders of magnitude or more. At the same time the measured rates do not show the sharp resonance structure normally associated with DR [14,19,36]. The MBQC statistical theory quantitatively explains the discrepancy as being due to a very dense spectrum of compound resonances: multiply excited, strongly mixed, chaotic many-electron eigenstates.…”

Section: Theorymentioning

confidence: 81%

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Level-resolved quantum statistical theory of electron capture into many-electron compound resonances in highly charged ions

et al. 2015

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The strong mixing of many-electron basis states in excited atoms and ions with open f shells results in very large numbers of complex, chaotic eigenstates that cannot be computed to any degree of accuracy. Describing the processes which involve such states requires the use of a statistical theory. Electron capture into these 'compound resonances' leads to electron-ion recombination rates that are orders of magnitude greater than those of direct, radiative recombination, and cannot be described by standard theories of dielectronic recombination. Previous statistical theories considered this as a two-electron capture process which populates a pair of single-particle orbitals, followed by 'spreading' of the two-electron states into chaotically mixed eigenstates. This method is similar to a configuration-average approach, as it neglects potentially important effects of spectator electrons and conservation of total angular momentum. In this work we develop a statistical theory which considers electron capture into 'doorway' states with definite angular momentum obtained by the configuration interaction method. We apply this approach to electron recombination with W 20+ , considering 2 million doorway states. Despite strong effects from the spectator electrons, we find that the results of the earlier theories largely hold. Finally, we extract the fluorescence yield (the probability of photoemission and hence recombination) by comparison with experiment.

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Section: Introductionsupporting

confidence: 77%

Section: Theorymentioning

confidence: 66%

Section: Theorymentioning

confidence: 81%

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Level-resolved quantum statistical theory of electron capture into many-electron compound resonances in highly charged ions

et al. 2015

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“…Experiment shows that the recombination rates at low (∼ 1 eV) electron energies in these ions and in Au 25+ exceed the direct RR rates by two orders of magnitude. At the same time the rates do not show the sharp resonance structure normally associated with DR [30][31][32]. Ref.…”

Section: Electron-ion Recombination a Chaotic Compound Resonances And...mentioning

confidence: 82%

Electron recombination, photoionization, and scattering via many-electron compound resonances

et al. 2013

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Highly excited eigenstates of atoms and ions with open f shell are chaotic superpositions of thousands, or even millions of Hartree-Fock determinant states. The interaction between dielectronic and multielectronic configurations leads to the broadening of dielectronic recombination resonances and relative enhancement of photon emission due to opening of thousands of radiative decay channels. The radiative yield is close to 100% for electron energy 1 eV and rapidly decreases for higher energies due to opening of many autoionization channels. The same mechanism predicts suppression of photoionization and relative enhancement of the Raman scattering. Results of our calculations of the recombination rate are in agreement with the experimental data for W 20+ and Au 25+ .

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“…The first RR experiment was performed with merged electron and ion beams in a single-pass arrangement [15]. In later RR experiments performed at different heavy ion storage rings (TSR, CRYRING, ESR) for a broad range of bare ions, ranging from He 2+ to U 92+ [16][17][18][19][20][21][22], total recombination rate coefficients were measured by detecting the recombined down-charged ions. In these experiments total rate coefficients versus the relative electron energy were determined integral over all empty shells up to the field ionization limit n f 1 appearing due to the motional electric fields present in the bending magnets of the ring.…”

Section: Introductionmentioning

confidence: 99%

Subshell-selective x-ray studies of radiative recombination ofU92+ions with electrons for very low relative energies

Banaś¹,

Pajek²,

Surzhykov³

et al. 2015

Phys. Rev. A

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Radiative recombination (RR) into the K shell and L subshells of U 92+ ions interacting with cooling electrons has been studied in an x-ray RR experiment at the electron cooler of the Experimental Storage Ring at GSI. The measured radiative recombination rate coefficients for electron-ion relative energies in the range 0-1000 meV demonstrate the importance of relativistic effects. The observed asymmetry of the measured K-RR x-ray emission with respect to the cooling energy, i.e., zero average relative velocity (v rel = 0), are explained by fully relativistic RR calculations. With our new approach, we show that the study of the angular distribution of RR photons for different relative energies opens new perspectives for detailed understanding of the RR of ions with cooling electrons in cold magnetized plasma.

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Influence of Magnetic Fields on Recombination Rates of Au25+

Cited by 5 publications

References 2 publications

Level-resolved quantum statistical theory of electron capture into many-electron compound resonances in highly charged ions

Level-resolved quantum statistical theory of electron capture into many-electron compound resonances in highly charged ions

Electron recombination, photoionization, and scattering via many-electron compound resonances

Subshell-selective x-ray studies of radiative recombination ofU92+ions with electrons for very low relative energies

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