X-ray-spectroscopy analysis of electron-cyclotron-resonance ion-source plasmas

Santos, J. P.; Costa, Ana Maria Medeiros da; Marques, J. P.; Martins, Maria Conceição; Indelicato, P.; Parente, F.

doi:10.1103/physreva.82.062516

Cited by 21 publications

(20 citation statements)

References 80 publications

(110 reference statements)

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“…We also searched for possible line contamination by satellite transitions. First, we examined calculations of ion production in the plasma [36,37] in order to assess whether potential satellite lines could contaminate the measured ones; these satellite lines appear to be either far enough in energy or too weak (compared to statistical uncertainties in the experimental spectra) to affect our energy determination. Secondly, the residues of all line fits were plotted, and no hint for satellite contamination was found.…”

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confidence: 99%

High-accuracy x-ray line standards in the 3-keV region

et al. 2013

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A set of 14 high-accuracy x-ray transition energies in the 2.4-3.1 keV range is presented, which can be used as x-ray standards. They were measured in two-to four-electron sulfur, chlorine, and argon ions produced in an electron-cyclotron resonance ion source, using a single spherically bent crystal spectrometer. The results include the first measurement of six transitions and improve the accuracy of six other experimental values. These measurements considerably extend the set of high-accuracy x-ray energies reported for highly charged ions. Their relative uncertainties range from 1 to 10 ppm. Theory only reaches such a precision in one-and two-electron ions. Our results thus have two distinct applications. On the one hand, they test predictions in two-electron ions [Artemyev, Shabaev, Yerokhin, Plunien, and Soff, Phys. Rev. A 71, 062104 (2005)], at the precision level of some two-photon QED contributions. We observe an agreement with theory for most of the transitions. On the other hand, the three-and four-electron ion transitions provide new benchmark energies for the calculation of missing theoretical contributions, such as Auger shifts or electronic correlations. Spectra were analyzed with an x-ray tracing simulation that contains all the relevant physics of the spectrometer.

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confidence: 99%

High-accuracy x-ray line standards in the 3-keV region

et al. 2013

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“…The present study is focused on atomic systems embedded in plasma environment. In recent years, atoms placed in external plasma environment have received considerable attention from researchers [11][12][13][14][15][16][17][18][19] due to their wide applications in various disciplines of science e.g. astrophysics, condensed matter physics, biology etc.…”

Section: Introductionmentioning

confidence: 99%

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

Bhattacharyya¹,

Saha

Mukherjee³

2015

Phys. Rev. A

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In this work, the controversy between the interpretations of recent measurements on dense aluminum plasma created with Linac coherent light sources (LCLS) X-ray free electron laser (FEL) and Orion laser has been addressed. In both kind of experiments, helium-like and hydrogen-like spectral lines are used for plasma diagnostics . However, there exist no precise theoretical calculations for He-like ions within dense plasma environment. The strong need for an accurate theoretical estimates for spectral properties of He-like ions in strongly coupled plasma environment leads us to perform ab initio calculations in the framework of Rayleigh-Ritz variation principle in Hylleraas coordinates where ion-sphere potential is used. An approach to resolve the long-drawn problem of numerical instability for evaluating two-electron integrals with extended basis inside a finite domain is presented here. The present values of electron densities corresponding to disappearance of different spectral lines obtained within the framework of ion-sphere potential show excellent agreement with Orion laser experiments in Al plasma and with recent theories. Moreover, this method is extended to predict the critical plasma densities at which the spectral lines of H-like and He-like carbon and argon ions disappear. Incidental degeneracy and level-crossing phenomena are being reported for the first time for two-electron ions embedded in strongly coupled plasma. Thermodynamic pressure experienced by the ions in their respective ground states inside the ion-spheres are also reported.

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“…A description of the mechanism leading to this spectrum can be found in Refs. Costa et al (2001); Martins et al (2001Martins et al ( , 2009); Santos et al (2010Santos et al ( , 2008Santos et al ( , 2011. The magnetic dipole (M1) transition has a natural width several orders of magnitude smaller than any line ever measured with a DCS until now.…”

Section: Resultsmentioning

confidence: 98%

“…One consequence of the ion creation and excited level population mechanisms described in Refs. Costa et al (2001); Martins et al (2001Martins et al ( , 2009Santos et al (2010Santos et al ( , 2008Santos et al ( , 2011 is that the 1s2s 3 S 1 level in He-like ions is strongly populated. It is created by ionization of the Li-like ion ground state 1s 2 2s.…”

Section: Ecrismentioning

confidence: 98%

A vacuum double-crystal spectrometer for reference-free X-ray spectroscopy of highly charged ions

Amaro

Szabo²,

Schlesser³

et al. 2014

Radiation Physics and Chemistry

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We have built a vacuum double crystal spectrometer, which coupled to an electron-cyclotron resonance ion source, allows to measure low-energy x-ray transitions in highly-charged ions with accuracies of the order of a few parts per million. We describe in detail the instrument and its performances. Furthermore, we present a few spectra of transitions in Ar 14+ , Ar 15+ and Ar 16+ . We have developed an ab initio simulation code that allows us to obtain accurate line profiles. It can reproduce experimental spectra with unprecedented accuracy. The quality of the profiles allows the direct determination of line width.

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X-ray-spectroscopy analysis of electron-cyclotron-resonance ion-source plasmas

Cited by 21 publications

References 80 publications

High-accuracy x-ray line standards in the 3-keV region

High-accuracy x-ray line standards in the 3-keV region

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

A vacuum double-crystal spectrometer for reference-free X-ray spectroscopy of highly charged ions

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