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- W2077887380 abstract "We report on a fully relativistic close-coupling (CC) calculation of the electron impact excitation (EIE) of $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$. The multiconfiguration Dirac-Fock (MCDF) method was used in a calculation of $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$ atomic structure. The EIE calculation of $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$ was carried out using the Dirac $R$-matrix method and the MCDF orbitals for principal quantum number $nensuremath{le}5$ with target states up to $n=5$ corresponding to $49mathrm{CC}$ (49 target states in the CC expansion). The EIE calculation included both resonance and channel coupling effects. We demonstrate that strong resonances appear in the excitation of the highly charged ion $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$, in particular for intercombination and forbidden transitions. Compared to less highly charged He-like ions, we show that for $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$ all $N$-shell and $O$-shell levels start to give rise to Rydberg resonant states dipping just below $M$-shell and $N$-shell target thresholds, respectively. In comparison with previous calculations carried out with either the close-coupling or the distorted wave method, our calculations show significant differences with respect to cross sections and effective collision strengths. The important $mathrm{Ne}phantom{rule{0.2em}{0ex}}mathrm{IX}$ line intensity $G$ ratio $(G=(i+f)∕r)=[mathrm{forbidden}+mathrm{intercombination}]∕mathrm{resonance})$ calculated based on our MCDF and Dirac $R$-matrix results is in good agreement with the existing accurate EBIT measurements. This calculation has direct applications to laboratory measurements and observations of astrophysical x-ray sources." @default.
- W2077887380 created "2016-06-24" @default.
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- W2077887380 date "2006-10-09" @default.
- W2077887380 modified "2023-09-23" @default.
- W2077887380 title "Fully relativisticR-matrix calculation of electron impact excitation ofNeIX" @default.
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- W2077887380 doi "https://doi.org/10.1103/physreva.74.042709" @default.
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