The forbidden transitions within 3s 2 3p 5 3d of Fe ix and Ni xi and 3s 2 3p 4 3d of Fe x and Ni xii

Edlén, Bengt; Smitt, Rikard

doi:10.1007/bf00160106

Cited by 36 publications

(28 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Not all of the lower levels of the 3s 2 3p 4 3d configuration are known. Edlen & Smitt (1978) suggested the identification of several forbidden lines observed in the UV and visible. This established the energies of several levels (Nos.…”

Section: A Discussion On Level Energies and Line Identificationsmentioning

confidence: 98%

See 1 more Smart Citation

Atomic data for astrophysics: Ni XII

Zanna

Badnell

2016

A&A

View full text Add to dashboard Cite

We present new large-scale R-matrix (up to n = 4) scattering calculations for the electron collisional excitation of Cl-like Ni xii. We used the intermediate-coupling frame transformation method. We compare predicted and observed line intensities using laboratory and solar spectra, finding good agreement for all the main soft X-ray lines. With the exception of the three strongest transitions, large discrepancies with previous estimates are found, especially for the decays from the lowest 3s 2 3p 4 3d levels. This includes the forbidden UV lines. The atomic data for the n = 4 levels are the first to be calculated. We revise previous experimental energies, and suggest several new identifications. We point out the uncertainty in the wavelength of the 3s 2 3p 5 2 P 1/2 -3s 2 3p 4 3d 2 D 3/2 transition, which is important for density diagnostics.

show abstract

Section: A Discussion On Level Energies and Line Identificationsmentioning

confidence: 98%

“…Several forbidden lines are also observed in the visible and UV part of the solar spectrum (Edlen & Smitt 1978). Nickel lines are also prominent in fusion plasma (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

Atomic data for astrophysics: Ni XII

Zanna

Badnell

2016

A&A

View full text Add to dashboard Cite

show abstract

“…Fe ix produces several strong forbidden lines, which, after several attempts, were finally identified by Edlen & Smitt (1978). Earlier literature estimated the intensities of these lines, and found several large inconsistencies (up to factors of two) with the observed values (see, e.g.…”

Section: Electron Density Diagnosticsmentioning

confidence: 99%

Atomic data for astrophysics: Fe IX

Zanna¹,

Storey

Badnell

et al. 2014

A&A

View full text Add to dashboard Cite

We present the results of a new large-scale intermediate-coupling frame transformation R-matrix scattering calculation for electron collisional excitation of Fe ix. The target includes all the main configurations up to n = 5, to improve our earlier R-matrix and distorted-wave (DW) calculations for the n = 3, 4 levels. Unlike similar calculations which we carried out for the other coronal iron ions, in this case the larger target does not significantly affect the collision strengths of the strongest transitions to the n = 3, 4 levels. Some differences are however present for a few transitions, in particular for the 3d-4p line at 197.86 Å. For the weaker transitions, significant enhancements due to extra resonances resulting from this much bigger target are found. Several new line identifications are suggested. We find excellent agreement between predicted and observed line intensities in the EUV (Hinode EIS) showing that Fe ix lines provide a reliable temperature diagnostic. We also show that the visible forbidden lines are a good diagnostic to measure electron densities.

show abstract

“…Many of these have most probably been observed, but not identified because of a lack of laboratory comparison data: this lack arises from the fact that the transition rates are lower than the collision rates in most terrestrial light sources, and thus the levels are quenched collisionally. While for Fe X a number of transitions from high-J levels have been identified in the solar corona (Smitt 1977, Edlén andSmitt 1978) at around the same time as calculations have been done in order to systematize the search for such transitions (Mason and Nussbaumer 1977), many of the similarly expected lines in the neighbouring spectra Fe XI through Fe XIII (that also feature high-J levels in the excited 3d configuration) are still missing.…”

Section: Introductionmentioning

confidence: 99%

M1/E2 transition rates in FeXthrough FeXIIImeasured at a heavy-ion storage ring

Trabert

Gwinner

Wolf

et al. 2002

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

The rates of several electric-dipole forbidden decays of 3p and 3d levels in Cl-, S-, P-and Si-like ions of Fe have been measured optically at a heavy-ion storage ring. In several cases, more than one decay contributes to a given decay curve, which complicates the analysis. The lifetime results, with a precision range from 0.6 to 20%, compare well with some theoretical predictions, but are more precise. They are also more precise than some experimental data from an electrostatic ion trap.

show abstract

The forbidden transitions within 3s 2 3p 5 3d of Fe ix and Ni xi and 3s 2 3p 4 3d of Fe x and Ni xii

Cited by 36 publications

References 14 publications

Atomic data for astrophysics: Ni XII

Atomic data for astrophysics: Ni XII

Atomic data for astrophysics: Fe IX

M1/E2 transition rates in FeXthrough FeXIIImeasured at a heavy-ion storage ring

Contact Info

Product

Resources

About