Photoionization of Highly Charged Ions Using an ECR Ion Source and Undulator Radiation

Bizau, J. M.; Esteva, J.M.; Cubaynes, D.; Wuilleumier, Fj; Blancard, C.; Ac, La Fontaine; Couillaud, C.; Lachkar, J.; Marmoret, R.; Remond, C.; Bruneau, J.; Hitz, D.; Ludwig, Peter; Delaunay, M.

doi:10.1103/physrevlett.84.435

Cited by 60 publications

(56 citation statements)

References 24 publications

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“…Most important, a 10 GHz all permanent magnet ECR ion source was installed. The source was developed by CEA Grenoble and has previously been used in similar experiments at the storage ring SuperACO (Bizau et al 2000(Bizau et al , 2001Champeaux et al 2003). The ion beam line was shortened and the ion optics simplified near the ion source in order to make space available for the ECR source, reduce space-charge effects and simplify the optimization.…”

Section: Methodsmentioning

confidence: 99%

“…In consequence, the number of ions for which cross-section data are available is increasing rapidly, with experiments being performed in Denmark 4+ (ASTRID, Kjeldsen et al 1999b), France (SuperACO, Bizau et al 2000), Japan (Photon Factory, Koizumi et al 1995;SPring-8, Yamaoka et al 2002) and USA (ALS, Covington et al 2001). For a review of the previous works, see West (2001).…”

Section: Introductionmentioning

confidence: 99%

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Absolute cross sections for L-shell photoionization of the ions N$\mathsf{^{2+}}$, N$\mathsf{^{3+}}$, O$\mathsf{^{3+}}$, O$\mathsf{^{4+}}$, F$\mathsf{^{3+}}$, F$\mathsf{^{4+}}$ and Ne$\mathsf{^{4+}}$

Bizau

Champeaux

Cubaynes

et al. 2005

A&A

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Absolute cross sections for L-shell photoionization of the ions N$\mathsf{^{2+}}$, N$\mathsf{^{3+}}$, O$\mathsf{^{3+}}$, O$\mathsf{^{4+}}$, F$\mathsf{^{3+}}$, F$\mathsf{^{4+}}$ and Ne$\mathsf{^{4+}}$

Bizau

Champeaux

Cubaynes

et al. 2005

A&A

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“…However, some shift in theoretical positions (by ϳ0.5 eV) can be seen for the next three resonances. The exact reason for this shift is not clear, but a possible reason could be the effect of correlations of configuration interactions for the 4 P symmetry. For the rest of the resonances the measured positions agree with the theoretical ones.…”

Section: Photoionization Cross Sections Of O IVmentioning

confidence: 98%

“…On the experimental side, accurate photoionization cross sections are being measured at several places, such as the merged ion-photon beam facility at the University of Aarhüs (e.g., for C II [3]), the Electron Cyclotron Resonant Ion Source (ECR) at the University of Paris-Sud (e.g., for Xe V-Xe VIII [4]), and the Advanced Light Source (ALS) at Berkeley (e.g., for O II [5]). Each of these three sophisticated experimental setups has different advantages in measurements, and the results often complement each other.…”

Section: Introductionmentioning

confidence: 99%

Photoionization cross sections of O II, O III, O IV, and O V: BenchmarkingR-matrix theory and experiments

Nahar

2004

Phys. Rev. A

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For crucial tests between theory and experiment, ab initio close-coupling calculations are carried out for photoionization of several oxygen ions: O II, O III, O IV, and O V. The relativistic fine-structure and resonance effects are studied using the R matrix and its relativistic variant, the Breit-Pauli R-matrix (BPRM) approximations. Extremely detailed comparison is made with high-resolution experimental measurements carried out in three different setups: Advanced Light Source at Berkeley, synchrotron radiation experiment with a new modulator at University of Aarhüs, and synchrotron radiation experiment at University of Paris-Sud. The comparisons illustrate physical effects in photoionization such as (i) fine structure, (ii) resolution, and (iii) metastable components. Photoionization cross sections PI of the ground and a few low-lying excited states of these ions obtained in the experimental spectrum include combined features of these states. The general features of the measured PI were predicted in the earlier calculations in LS coupling. However, due to higher-resolution achievement in the recent experiments, the theoretically calculated resonances need to be resolved with much finer energy mesh for precise comparison. In addition, prominent resonant features are observed in the measured spectra that can form from transitions allowed with relativistic fine structure, but not in LS coupling. Present results include calculations from both LS coupling and the relativistic BPRM method to decipher the features in photoionization spectra. PI are obtained for ground and metastable (i) Most of the computed theoretical resonance structures are seen experimentally, although there are some discrepancies. One of the main conclusions of the present study is that resonances in photoionization cross sections of the ground and metastable states can be a diagnostic of experimental beam composition, with potential applications to astrophysical and laboratory plasma environments.

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“…[5]). The other major approach to PI of ions is the use of merged-beam techniques [6][7][8][9]. Photon and ion beams are brought to overlap over a certain interaction region, and the resulting ions are separated as a beam and detected as a function of the photon energy.…”

Section: Introductionmentioning

confidence: 99%

Photoionizing trapped highly charged ions with synchrotron radiation

López‐Urrutia

Simon²,

Beilmann

et al. 2012

AIP Conference Proceedings

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Abstract. Photoabsorption by highly charged ions plays an essential role in astrophysical plasmas. Diagnostics of photoionized plasmas surrounding binary systems rely heavily on precise identification of absorption lines and on the knowledge of their cross sections and widths. Novel experiments using an electron beam ion trap, FLASH EBIT, in combination with monochromatic synchrotron radiation allow us to investigate ions in charge states hitherto out of reach. Trapped ions can be prepared in any charge state at target densities sufficient to measure absorption cross sections below 0.1 Mb. The results benchmark state-of-the-art predictions of the transitions wavelengths, widths, and absolute cross sections. Recent high resolution results on Fe 14+ , Fe 15+ , and Ar 12+ at photon energies up to 1 keV are presented.

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Photoionization of Highly Charged Ions Using an ECR Ion Source and Undulator Radiation

Cited by 60 publications

References 24 publications

Absolute cross sections for L-shell photoionization of the ions N$\mathsf{^{2+}}$, N$\mathsf{^{3+}}$, O$\mathsf{^{3+}}$, O$\mathsf{^{4+}}$, F$\mathsf{^{3+}}$, F$\mathsf{^{4+}}$ and Ne$\mathsf{^{4+}}$

Absolute cross sections for L-shell photoionization of the ions N$\mathsf{^{2+}}$, N$\mathsf{^{3+}}$, O$\mathsf{^{3+}}$, O$\mathsf{^{4+}}$, F$\mathsf{^{3+}}$, F$\mathsf{^{4+}}$ and Ne$\mathsf{^{4+}}$

Photoionization cross sections of O II, O III, O IV, and O V: BenchmarkingR-matrix theory and experiments

Photoionizing trapped highly charged ions with synchrotron radiation

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