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Theoretical study on dielectronic recombination of O$$^{6+}$$ ions in metastable states

Zhao, L.-B.*; Shirai, Toshizo

A computational scheme, based on the theory of continuum-bound transitions of Bell and Seaton [J. Phys. B $${bf 18}$$, 1589 (1985)] and the close-coupling R-matrix approach, has been developed to treat dielectronic recombination (DR) in high-lying resonance energy regions. This scheme and our presented numerical method to compute DR in low-lying resonance energy regions [Phys. Rev. A $${bf 62}$$, 022706 (2000)] have been applied together to elucidate the experimental spectra of DR of O$$^{6+}$$ ions in the metastable $$1s2s,,^3S$$ and $$1s2s,,^1S$$ states. For comparison, a perturbative theoretical calculation of DR for O$$^{6+}$$ has also been accompanied. The reasonable representation of the general dielectronic spectral shape is yielded by both our close-coupling and perturbative calculations. However, both the methods do not reproduce the experimental double peak structure at $$sim$$ 6-8 eV. This shows that the further investigation on DR of this kind of ions is required both experimentally and theoretically.



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