X-ray emission associated with radiative recombination for 
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 ions at threshold energies

Zhu, Bingguo; Gumberidze, A.; Over, Tobias; Weber, G.; Andelkovic, Zoran; Bräuning‐Demian, A.; Chen, R.; Dmytriiev, D.; Forstner, O.; Hahn, Christoph; Herfurth, F.; Herdrich, Marc Oliver; Hillenbrand, P.‐M.; Kalinin, Anton; Kröger, Felix Martin; Lestinsky, M.; Litvinov, Yu. A.; Menz, Esther Babette; W., Middents,; Morgenroth, T.; Petridis, N.; Pfäfflein, Philip; Sanjari, M. S.; Sidhu, R. S.; Spillmann, U.; Schuch, R.; Schippers, S.; Trotsenko, S.; Varga, L.; Vorobyev, Gleb; Stöhlker, Th.

doi:10.1103/physreva.105.052804

Cited by 11 publications

(16 citation statements)

References 82 publications

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“…In the case of the Balmer series, a multitude of transitions, basically due to the fine-structure splitting of the n = 2 and n = 3 states, are clearly visible in both X-ray detectors. Following the radiative cascade simulation procedure [22], the most populated states 3d 5/2 and 3d 3/2 resulting from Yrast-Cascades chain contribute to the formation of two intense Balmer lines, which are the transitions of 3d 5/2 → 2p 3/2 (Balmer-α 1 ) and 3d 3/2 → 2p 1/2 (Balmer-α 2 ), as observed in this experiment shown in Figure 2. Only small discrepancies are observed in the region of Paschen lines.…”

Section: Data Analysis and Resultsmentioning

confidence: 62%

“…In practice, however, one may expect that, apart from the direct recombination, the feeding transitions from high-lying levels will also contribute to the population of the ionic substates. In this way, states with main quantum number n = 1 up to high-Rydberg states such as n = 165 were incorporated in the description of subsequent cascade processes [22] by solving a couple of rate equations [23], written as…”

Section: Data Analysis and Resultsmentioning

confidence: 99%

“…X-ray spectra measured at observation angles of (a) 0 • and (b) 180• by two high-purity Ge(i) detectors in coincidence with down-charged Pb 81+ ions. The blue dashed lines give the result of time-integrated spectra based on a cascade simulation program[22]. Here, the energy dependent efficiencies of two Ge(i) detectors are corrected.…”

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confidence: 99%

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Radiative Recombination Studies for Bare Lead Ions Interacting with Low-Energy Electrons

Zhu

Stöhlker

2022

Atoms

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X-ray emission as a result of radiative recombination (RR) at threshold energies in the electron cooler of CRYRING@ESR was investigated for decelerated bare lead ions at a beam energy of 10 MeV/u. The recorded spectra are dominated by characteristic transitions in Pb81+, namely, the Lyman, Balmer and Paschen series, as a result of decay cascades from high-n states that are preferentially populated by the RR processes. In addition, a rigorous theoretical model is applied for the interpretation of measured X-ray spectra, and shows good agreement.

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Section: Data Analysis and Resultsmentioning

confidence: 62%

Section: Data Analysis and Resultsmentioning

confidence: 99%

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Radiative Recombination Studies for Bare Lead Ions Interacting with Low-Energy Electrons

Zhu

Stöhlker

2022

Atoms

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“…For each setting of (N photon , ∆E FWHM ), we employed a Monte Carlo method to generate 500 synthetic N, M → L spectra. The N, M → L transition energies were calculated using the Flexible Atomic Code (FAC) [20,21] and the line intensities were predicted using a detailed model of the initial population by the RR process in combination with the subsequent decay cascades [16]. When setting the kinetic energy of the ion beam to 10.225 MeV/u, i.e., identical to the recent measurement, the simulation yields spectra very similar to the experimental data.…”

Section: Resultsmentioning

confidence: 93%

“…Due to the selection rules in combination with the high orbital angular momentum of the initially populated states, most of the recombined electrons pass through a state with the highest orbital angular momentum for a given shell at some point during their cascade. Therefore, the formation of an U 90+ ion in the cooler section typically results in the emission of numerous characteristic photons along a yrast decay pattern [15,16].…”

Section: Resultsmentioning

confidence: 99%

Towards an Intrinsic Doppler Correction for X-ray Spectroscopy of Stored Ions at CRYRING@ESR

Kröger

Weber

Allgeier

et al. 2023

Atoms

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We report on a new experimental approach for the Doppler correction of X-rays emitted by heavy ions, using novel metallic magnetic calorimeter detectors which uniquely combine a high spectral resolution with a broad bandwidth acceptance. The measurement was carried out at the electron cooler of CRYRING@ESR at GSI, Darmstadt, Germany. The X-ray emission associated with the radiative recombination of cooler electrons and stored hydrogen-like uranium ions was investigated using two novel microcalorimeter detectors positioned under 0∘ and 180∘ with respect to the ion beam axis. This new experimental setup allowed the investigation of the region of the N, M → L transitions in helium-like uranium with a spectral resolution unmatched by previous studies using conventional semiconductor X-ray detectors. When assuming that the rest-frame energy of at least a few of the recorded transitions is well-known from theory or experiments, a precise measurement of the Doppler shifted line positions in the laboratory system can be used to determine the ion beam velocity using only spectral information. The spectral resolution achievable with microcalorimeter detectors should, for the first time, allow intrinsic Doppler correction to be performed for the precision X-ray spectroscopy of stored heavy ions. A comparison with data from a previous experiment at the ESR electron cooler, as well as the conventional method of conducting Doppler correction using electron cooler parameters, will be discussed.

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Parity‐Time Symmetry in Magnetic Materials and Devices

Zhang,

Xin,

Liu

2023

Adv Elect Materials

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Non‐Hermitian Hamiltonians may still possess real eigenvalues in case of the existence of parity‐time (PT) symmetry. Exceptional points (EPs) occur at the phase transition from real to complex eigenvalues due to PT‐symmetry breaking in the parameter space. Magnonic devices use magnons to carry, transport, and process information, which have the advantages of low energy dissipation, wave‐based computing, and nonlinear data processing. The combination of PT‐symmetry and magnonics may lead to novel physics as well as unprecedented functional device applications. Recently, the research of PT‐symmetry in magnetism has developed rapidly. In this review, the theoretical predictions as well as experimental findings of PT‐symmetry in magnetism are summarized. First, a brief introduction to PT symmetry, EPs, and anti‐PT symmetry is presented. Second, the theoretical and experimental progress of magnonic PT symmetry are summarized. Third, the theoretical predictions of higher‐order EPs and anti‐PT symmetry in magnonic systems are given. Finally, the study concludes by discussing the future challenges and research prospects in magnonic PT‐symmetry, and proposals for experimental observations of magnonic higher‐order EPs and anti‐PT symmetry are suggested.

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X-ray emission associated with radiative recombination for Pb82+ ions at threshold energies

Cited by 11 publications

References 82 publications

Radiative Recombination Studies for Bare Lead Ions Interacting with Low-Energy Electrons

Radiative Recombination Studies for Bare Lead Ions Interacting with Low-Energy Electrons

Towards an Intrinsic Doppler Correction for X-ray Spectroscopy of Stored Ions at CRYRING@ESR

Parity‐Time Symmetry in Magnetic Materials and Devices

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