Energies and E1, M1, E2, M2 transition rates for states of the 2s22p, 2s2p2, and 2p3 configurations in boron-like ions between N III and Zn XXVI

Rynkun, Pavel; Jönsson, P.; Gaigalas, Gediminas; Fischer, Charlotte Froese

doi:10.1016/j.adt.2011.08.004

Cited by 49 publications

(67 citation statements)

References 29 publications

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“…It can be seen from the table that there is extremely good agreement between Model 2 and Rynkun et al (2012), with discrepancies of less than 5%. The Model 1 calculation also exhibits good agreement with Rynkun et al (2012), since the differences are less Rynkun et al (2012).…”

Section: Transition Probabilitiesmentioning

confidence: 70%

“…Typically, any differences were less than 15% for the forbidden transitions and 5% for the dipole-allowed transitions. The present transition probabilities were also compared with the extensive calculation of Rynkun et al (2012), and very good agreement was found.…”

Section: Discussionmentioning

confidence: 97%

“…In Table 2 the present results are compared with those of Rynkun et al (2012) and Bhatia & Thomas (1998) for the first few E1 transitions to further assess the credibility of both models. It can be seen from the table that there is extremely good agreement between Model 2 and Rynkun et al (2012), with discrepancies of less than 5%. The Model 1 calculation also exhibits good agreement with Rynkun et al (2012), since the differences are less Rynkun et al (2012).…”

Section: Transition Probabilitiesmentioning

confidence: 99%

“…Rynkun et al (2012) performed one of the most extensive oscillator strength calculations for the Boron-like iso-electronic sequence using the MCDHF method. In Table 2 the present results are compared with those of Rynkun et al (2012) and Bhatia & Thomas (1998) for the first few E1 transitions to further assess the credibility of both models. It can be seen from the table that there is extremely good agreement between Model 2 and Rynkun et al (2012), with discrepancies of less than 5%.…”

Section: Transition Probabilitiesmentioning

confidence: 99%

“…Effective collision strengths were taken from the M1 calculation and transition probabilities from Rynkun et al (2012) where available. For all other transition probabilities, the M2 calculations were adopted.…”

Section: Emission Line Intensitiesmentioning

confidence: 99%

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Electron impact excitation of Mg VIII

Grieve

Ramsbottom

Keenan

2013

A&A

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Context. Mg  emission lines are observed in a range of astronomical objects such as the Sun, other cool stars and in the coronal line region of Seyfert galaxies. Under coronal conditions Mg  emits strongly in the extreme ultraviolet (EUV) and soft X-ray spectral regions which makes it an ideal ion for plasma diagnostics. Aims. Two theoretical atomic models, consisting of 125 fine structure levels, are developed for the Mg  ion. The 125 levels arise from the 2s 2 2p, 2s2p 2 , 2p 3 , 2s 2 3s, 2s 2 3p, 2s 2 3d, 2s2p3s, 2s2p3p, 2s2p3d, 2p 2 3s, 2p 2 3p and 2p 2 3d configurations. Electron impact excitation collision strengths and radiative transition probabilities are calculated for both Mg  models, compared with existing data, and the best model selected to generate a set of theoretical emission line intensities. The EUV lines, covering 312-790 Å, are compared with existing solar spectra (SERTS-89 and SUMER), while the soft X-ray transitions (69-97 Å) are examined for potential density diagnostic line ratios and also compared with the limited available solar and stellar observational data. Methods. The R-matrix codes Breit-Pauli RMATRXI and RMATRXII are utilised, along with the PSTGF code, to calculate the collision strengths for two Mg  models. Collision strengths are averaged over a Maxwellian distribution to produce the corresponding effective collision strengths for use in astrophysical applications. Transition probabilities are also calculated using the CIV3 atomic structure code. The best data are then incorporated into the modelling code CLOUDY and line intensities generated for a range of electron temperatures and densities appropriate to solar and stellar coronal plasmas.Results. The present effective collision strengths are compared with two previous calculations. Good levels of agreement are found with the most recent, but there are large differences with the other for forbidden transitions. The resulting line intensities compare favourably with the observed values from the SERTS-89 and SUMER spectra. Theoretical soft X-ray emission lines are presented and several density diagnostic line ratios examined, which are in reasonable agreement with the limited observational data available.

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Section: Transition Probabilitiesmentioning

confidence: 70%

Section: Discussionmentioning

confidence: 97%

Section: Transition Probabilitiesmentioning

confidence: 99%

Section: Transition Probabilitiesmentioning

confidence: 99%

Section: Emission Line Intensitiesmentioning

confidence: 99%

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Electron impact excitation of Mg VIII

Grieve

Ramsbottom

Keenan

2013

A&A

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Delta Baryon Photoproduction with Twisted Photons

Afanasev

Carlson

2021

Annalen der Physik

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A future gamma factory at CERN or accelerator‐based gamma sources elsewhere can include the possibility of energetic twisted photons, which are photons with a structured wave front that can allow a pre‐defined large angular momentum along the beam direction. Twisted photons are potentially a new tool in hadronic physics, and one possibility is considered here, namely the photoproduction of Δ(1232) baryons using twisted photons. It is shown that particular polarization amplitudes isolate the smaller partial wave amplitudes and they are measurable without interference from the terms that are otherwise dominant.

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