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Woitke, O.; Djurić, N.; Dunn, G. H.; Bannister, M. E.; Smith, A. C. H.; Wallbank, B.; Badnell, N. R.; Pindzola, M. S.

doi:10.1103/physreva.58.4512

Cited by 30 publications

(14 citation statements)

References 26 publications

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“…2). For this ion, the RMPS results were found to excellently agree with the recent near-threshold ÁE ¼ 6:00 eV ð Þ experimental data [14]. The open circles and shadowed squares on the plot represent the absolute and relative measurements, respectively (see Ref.…”

supporting

confidence: 74%

“…Although the number of theoretical publications on excitation of Li-like ions of beryllium and boron is quite significant, the only available experimental cross sections for Be II [13] and B III [14] were measured for the resonance excitation 2s À 2p; for the latter only the near-threshold region having been investigated so far. Figures 1 and 2 show these data and the presently calculated cross sections and earlier calculations by the RMPS and DW methods.…”

mentioning

confidence: 99%

“…The open circles and shadowed squares on the plot represent the absolute and relative measurements, respectively (see Ref. [14] for more details). The calculated CCC cross sections are, however, about 10% higher than the RMPS although still being within experimental error bars.…”

mentioning

confidence: 99%

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Excitation Cross Sections for Li-like Ions of Beryllium and Boron

et al. 2003

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We report on calculation of electron-impact excitation cross sections for Li-like ions of boron and beryllium. The data were produced with a number of modern methods in atomic collision theory, such as convergent close-coupling, K-matrix and Coulomb-Born-exchange. The results obtained are compared with other calculations and available expermental data, and the recommended cross sections for all transitions between atomic terms with principal quantum numbers n 4 are presented as tables of fitting parameters.Due to the importance of beryllium and boron for fusion and astrophysics, the collisional data for ions of these elements have often been a subject of research, including calculations of excitation cross sections. The most recent compilation of the recommended data for electron-impact excitation of the Be qþ and B qþ ions [1] was principally based on the R-matrix (RM) and distorted-wave (DW) methods, and included transitions from the ground into the n ¼ 2 and n ¼ 3 excited states for all ions. It was found later [2,3] that the accuracy of the calculated RM and DW cross sections, which were used for deriving the recommended data sets for the Li-like ions of beryllium and boron, may be inferior to that of the recently developed methods, such as the convergent close-coupling (CCC) and the R-matrix with pseudostates (RMPS). The disagreement was found to be especially noticeable for the intermediate energy region, where the coupling with the continuum states is important, and hence the applicability of the recommended data [1] may be limited. In addition, as has been noted above, transitions between excited states were not considered in Ref. [1]. It has to be mentioned that the cross sections for the transitions between excited states can only rarely be found in the literature, although they may be very important for applications. This can be exemplified by the experiment on laser pumping of specific atomic levels [4], where such transitions crucially affect the measured light emission. Thus, it seems appropriate to produce a new set of highaccuracy excitation data for the Li-like ions of boron and beryllium, including transitions between excited states.The non-perturbative close-coupling (CC) type methods, which are known to provide the highest accuracy among the existing theoretical approaches, normally require significant computational efforts, in terms of both hardware requirements and computation times. This justifies development of simpler and faster, yet sufficiently accurate, methods which could be of practical use with widely available computational tools. As for the highly-charged H-and Li-like ions, it was already shown [5,6] that the first-order Coulomb-Bornexchange method (CBE) with normalization on one channel can be reliably applied to the calculation of the excitation cross sections for ions with a large spectroscopic charge (Z ! 3). For the low-charge ions, however, the channel interaction effects, which are ignored within the CBE approximation, become more important and thus require applic...

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confidence: 74%

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confidence: 99%

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Excitation Cross Sections for Li-like Ions of Beryllium and Boron

et al. 2003

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“…Experimental B III 2s − 2p excitation cross-sections exist [21]. However, we can only compare the SLSP4 calculations for the energy E = 7 eV, slightly above the threshold (6 eV).…”

Section: Inelastic Excitation Cross-sectionmentioning

confidence: 99%

The Third and Fourth Workshops on Spectral Line Shapes in Plasma Code Comparison: Isolated Lines

Stambulchik

Dimitrijević

Alexiou

et al. 2018

Atoms

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“…DW calculations include rate coefficients from ground and excited levels of Ar L shell ions by Cohen et al (1998), and by Griffin, Bottcher and Pindzola (1982a) and Griffin, Pindzola and Bottcher (1987). Also in this category are the calculations for Na-like and Mg-like ions and Fe 5+ -Fe 13+ by Pindzola et al (1986aPindzola et al ( ,b, 1998, and Mitnik et al (1998), for Fe 0+ by Pindzola et al (1995) and for all ions of Ni by Griffin and Pindzola (1988) and Pindzola et al (1991). CBE calculations of EII with inclusion of EA in the H -C isoelectronic sequences were performed by Sampson andGolden (1979, 1981), and Sampson (1982) made similar calculations for Na-like ions Close-coupling calculations including inner shell excitation and EA were made for Li-like ions of C, N, and O (Henry, 1979), Na-like ions of Al and Si (Henry and Msezane, 1982), and for Fe 23+ using Rmatrix (Butler and Moores, 1985).…”

Section: Experimental Measurementsmentioning

confidence: 99%

Atomic data for x-ray astrophysics

2007

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We review the available atomic data used for interpreting and modeling X-ray observations. The applications for these data can be divided into several levels of detail, ranging from compilations which can be used with direct inspection of raw data, such as line finding lists, to synthetic spectra which attempt to fit to an entire observed dataset simultaneously. This review covers cosmic sources driven by both electron ionization and photoionization and touches briefly on planetary surfaces and atmospheres. We review all of this, the applications to X-ray astronomy, the available data, recommendations for astronomical users, and attempt to point out the applications where the shortcomings are greatest.

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Absolute cross sections for excitation of the2s2S→2p

Cited by 30 publications

References 26 publications

Excitation Cross Sections for Li-like Ions of Beryllium and Boron

Excitation Cross Sections for Li-like Ions of Beryllium and Boron

The Third and Fourth Workshops on Spectral Line Shapes in Plasma Code Comparison: Isolated Lines

Atomic data for x-ray astrophysics

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