Polarization measurements of the Lyman-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>α</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:math>x-ray emission lines of hydrogenlike<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi mathvariant="normal">Ar</mml:mi><mml:mrow><mml:mn>17</mml:mn><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mm

Robbins, David; Beiersdörfer, P.; Faenov, A. Ya.; Pikuz, T. A.; Thorn, D. B.; Chen, H.; Reed, K. J.; Smith, A. J.; Boyce, K. R.; Brown, G. V.; Kelley, R. L.; Kilbourne, C. A.; Porter, F. S.

doi:10.1103/physreva.74.022713

Cited by 57 publications

(42 citation statements)

References 26 publications

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“…In particular, we report measurements of the DR satellite transitions and their parent resonance lines of Fe XXV and Fe XXVI. Earlier measurements of the K-shell X-ray emission of highly charged ions conducted with the microcalorirneter on EBIT-I have been limited to lines" produced by electron-impact excitation [25][26][27][28][29], measurements of the associated X-ray polarization [30], and lines produced by charge exchange [31][32][33][34]. The present measurements were obtained with a thermal plasma sinnulation technique implemented on EBIT-I.…”

Section: Introductionmentioning

confidence: 99%

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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We present laboratory spectra of dielectronic recombination (DR) satellite tnmsitions attached to the He-like and H-like iron resonance lines obtained widt me NASA Goddard Space Flight Center X-ray calorimeter and produced by a thermal plasma simu1ation technique on the EBIT-I electron beam ion trap at the Lawrence Livennore National Laboratory. We demonstrate that the ca10rimeter has sufficient spectral resoiution in the 6-9 keY range to provide reliable measurements not only of standard DR satellite to resonance line intensities but also of DR satellite to DR satellite ratios that can be used to diagnose nonthermal electron distributions. Electron temperatures derived from the measured line intensities are consistent with the temperature of the simulated plasma. Temperature measurements based on DR satellite transitions have significant advantages over those based on collisional ionization equilibrium or continuum shape. Thus, successful demonstration of this method with the X-ray calorimeter is an important step fur its application in X-ray astronomy.

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Section: Introductionmentioning

confidence: 99%

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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“…1. The coincident registration of the x rays completely removes one major restriction of most of the earlier experiments-the contribution of cascades to the alignment of the excited state [10,[14][15][16][17]. We observed large alignment angles that manifest the coherent population of the magnetic substates.…”

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confidence: 55%

“…Moreover, the coincident x-ray detection suppressed the contribution of the cascades from the n > 2 states to the Lyα x rays. In earlier alignment experiments, these cascades significantly influenced the results [10,[14][15][16][17]. In Fig.…”

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confidence: 98%

Observation of Coherence in the Time-Reversed Relativistic Photoelectric Effect

et al. 2014

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The photoelectric effect has been studied in the regime of hard x rays and strong Coulomb fields via its time-reversed process of radiative recombination (RR). In the experiment, the relativistic electrons recombined into the 2p 3=2 excited state of hydrogenlike uranium ions, and both the RR x rays and the subsequently emitted characteristic x rays were detected in coincidence. This allowed us to observe the coherence between the magnetic substates in a highly charged ion and to identify the contribution of the spin-orbit interaction to the RR process.

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“…The polarization effects in spectral line emission due to anisotropic excitation and/or dielectronic capture by monodirectional beam electrons are a subject of continuing interest (see, e.g., [37][38][39][40][41][42]). To include the anisotropic effects, one can develop an extensive CR model resolved in magnetic sublevels for autoionizing states; this model will be described below.…”

Section: Comparisons and Discussionmentioning

confidence: 99%

AnisotropicLMNdielectronic resonances from ratios of magnetic-dipole lines

Ralchenko

Gillaspy

2013

Phys. Rev. A

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Signatures of multi-keV LM N dielectronic resonances in highly-charged 3d n ions of tungsten were detected in the intensity ratios of extreme-ultraviolet magnetic-dipole lines within ground configurations. The measurements were performed with an electron beam ion trap at beam energies of about 6 keV. Large-scale collisional-radiative modeling incorporating magnetic sublevels of autoionizing levels showed the significance of anisotropy effects due to the monodirectional propagation of the electron beam. The observation method allows simultaneous resolved registration of dielectronic resonances from several ions.

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Polarization measurements of the Lyman-α1x-ray emission lines of hydrogenlikeAr17+and

Cited by 57 publications

References 26 publications

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Observation of Coherence in the Time-Reversed Relativistic Photoelectric Effect

AnisotropicLMNdielectronic resonances from ratios of magnetic-dipole lines

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