Erratum: Polarization measurement of dielectronic recombination transitions in highly charged krypton ions [Phys. Rev. A<b>92</b>, 042702 (2015)]

Shah, Chintan; Jörg, Holger; Bernitt, Sven; Dobrodey, Stepan; Steinbrügge, René; Beilmann, C.; Amaro, Pedro; Hu, Zhimin; Weber, Sebastian; Fritzsche, S.; Surzhykov, A.; López‐Urrutia, J. R. Crespo; Tashenov, S.

doi:10.1103/physreva.94.029905

Cited by 8 publications

(8 citation statements)

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“…Such extensive comparisons between independent theories and experiments in S19 provided us good confidence over the validity of the polarization predictions. We also note that the FAC polarization predictions are also thoroughly benchmarked in previous experiments at FLASH-EBIT (Shah et al 2015(Shah et al , 2016(Shah et al , 2018Amaro et al 2017). Here, we inferred the total flux (F tot ) from the observed flux in the experiment (F 90 ) through F tot = 4πF 90 (3 − P)/3, where P is the degree of polarization.…”

Section: Fe-l Data Measured With Flash-ebitsupporting

confidence: 55%

“…Typical uncertainties on the measured cross section data are ∼10−25%. This can be improved for an example by implementing new measurement techniques at the EBIT, such as simultaneous X-ray observations with wideband high-resolution transition-edge sensor microcalorimeters (Durkin et al 2019;Szypryt et al 2019) and polarization measurements (Shah et al 2015(Shah et al , 2016(Shah et al , 2018 using dedicated X-ray polarimeters (Weber et al 2015;Beiersdorfer et al 2016). Further improvements can also be achieved by measuring the A&A 641, A93 (2020) electron beam and ion cloud overlap in the EBIT (Liang et al 2009;Arthanayaka et al 2020).…”

Section: Needs For Benchmarks With Laboratory Datamentioning

confidence: 99%

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X-ray spectra of the Fe-L complex

Shah

Mao

et al. 2020

A&A

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The Hitomi results for the Perseus cluster have shown that accurate atomic models are essential to the success of X-ray spectroscopic missions and just as important as the store of knowledge on instrumental calibration and astrophysical modeling. Preparing the models requires a multifaceted approach, including theoretical calculations, laboratory measurements, and calibration using real observations. In a previous paper, we presented a calculation of the electron impact cross sections on the transitions forming the Fe-L complex. In the present work, we systematically tested the calculation against cross-sections of ions measured in an electron beam ion trap experiment. A two-dimensional analysis in the electron beam energies and X-ray photon energies was utilized to disentangle radiative channels following dielectronic recombination, direct electron-impact excitation, and resonant excitation processes in the experimental data. The data calibrated through laboratory measurements were further fed into a global modeling of the Chandra grating spectrum of Capella. We investigated and compared the fit quality, as well as the sensitivity of the derived physical parameters to the underlying atomic data and the astrophysical plasma modeling. We further list the potential areas of disagreement between the observations and the present calculations, which, in turn, calls for renewed efforts with regard to theoretical calculations and targeted laboratory measurements.

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Section: Fe-l Data Measured With Flash-ebitsupporting

confidence: 55%

Section: Needs For Benchmarks With Laboratory Datamentioning

confidence: 99%

X-ray spectra of the Fe-L complex

Shah

Mao

et al. 2020

A&A

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“…The linear polarization measurements of x-rays emitted due to dielectronic recombination into highly charged Kr ions were recently presented in [3].…”

Section: Introductionmentioning

confidence: 99%

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Lyashchenko

Andreev

2016

Phys. Rev. A

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“…The measured intensity of the emitted radiation from these ions strongly depends on the angle of observation relative to the beam axis. There have been several studies reported in the literature for the polarization of radiation emitted from ions trapped in an EBIT (Henderson et al 1990;Beiersdorfer et al 1996;Taḱacs et al 1996;Gu et al 1999;Liang et al 2009a;Hu et al 2014b;Shah et al 2015). In the present study, we measured EUV spectra using CoBIT at 90…”

Section: Experiments and Data Analysismentioning

confidence: 94%

Measurements of density dependent intensity ratios of extreme ultraviolet line emission from Fe X, XI, and XII

Shimizu

Ali

Tsuda

et al. 2017

A&A

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We report high-resolution density dependent intensity ratio measurements for middle charge states of iron in the extreme ultraviolet (EUV) spectral wavelength range of 160−200 Å. The measurements were performed at the Tokyo EBIT laboratory by employing a flat-field grazing incidence spectrometer installed on a low energy compact electron beam ion trap. The intensity ratios for several line pairs stemming from Fe X, Fe XI and Fe XII were extracted from spectra collected at the electron beam energies of 340 and 400 eV by varying the beam current between 7.5 and 12 mA at each energy. In addition, the effective electron densities were obtained experimentally by imaging the electron beam profile and ion cloud size with a pinhole camera and visible spectrometer, respectively. In this paper, the experimental results are compared with previous data from the literature and with the present calculations performed using a collisional-radiative model. Our experimental results show a rather good agreement with the calculations and previous reported results.

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Erratum: Polarization measurement of dielectronic recombination transitions in highly charged krypton ions [Phys. Rev. A92, 042702 (2015)]

Cited by 8 publications

References 0 publications

X-ray spectra of the Fe-L complex

X-ray spectra of the Fe-L complex

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Measurements of density dependent intensity ratios of extreme ultraviolet line emission from Fe X, XI, and XII

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