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- W3208045542 abstract "A general relativistic distorted-wave expression of the multipole cross sections for anisotropic excitation of ions by impact with an electron beam is derived by taking into account the coherence between magnetic sublevels. These multipole cross sections are required in the analysis of the intensity and polarization of lines emitted from plasmas with cylindrically symmetric electron velocity distributions. To calculate such cross sections for highly charged target ions, we need to adapt the distorted-wave excitation program of the Flexible Atomic Code by making some modifications. Detailed computations are performed for transitions in the Be-like ion ${mathrm{O}}^{4+}$ from the ground $2{s}^{2}$ and metastable triplet $2s2p$ levels. A selected series of results for transitions from $2s2pphantom{rule{0.16em}{0ex}}^{3}P_{1,2}$ to $2s3pphantom{rule{0.16em}{0ex}}^{3}P_{1,2}$ and $2s3dphantom{rule{0.16em}{0ex}}^{3}D_{2,3}$ levels, which may be of interest for the solar atmosphere and tokamak plasmas, are given to illustrate the application of the modified program suggested here. Indepth analysis of the numerical results and preliminary comparison with available data in the literature provide a systematic consistency of the modified program, paving the way for computations of a large amount of multipole cross sections's data with a considerable saving of time." @default.
- W3208045542 created "2021-11-08" @default.
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- W3208045542 date "2021-10-27" @default.
- W3208045542 modified "2023-10-17" @default.
- W3208045542 title "Computations of the multipole cross sections for directional excitation of ions by electron impact" @default.
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- W3208045542 doi "https://doi.org/10.1103/physreva.104.042818" @default.
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