Measurement of femtosecond atomic lifetimes using ion traps

Träbert, Elmar

doi:10.1007/s00340-013-5586-z

Cited by 9 publications

(5 citation statements)

References 24 publications

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“…These experiments with an uncertainty larger than 0.5% are however not sensitive enough to test the underlying relativistic correlations and the leading QED effects. New experiments with the soft x-ray free electron laser (FLASH) and a new EBIT [41] along with the pump probe x-ray laser experiments [42] are hopeful to provide experimental data for the transitions with short lifetimes in so far inaccessible energy ranges. We believe that our calculations will support such future experiments for transitions with different frequencies and lifetimes.…”

Section: Resultsmentioning

confidence: 99%

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions

et al. 2018

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The magnetic dipole (M1) line strength between the fine-structure levels of the ground configurations in B-, F-, Al-and Cl-like ions are calculated for the four elements argon, iron, molybdenum and tungsten. Systematically enlarged multiconfiguration Dirac-Hartree-Fock (MCDHF) wave functions are employed to account for the interelectronic interaction with the Breit interaction included in first-order perturbation theory. The QED corrections are evaluated to all orders in αZ utilizing an effective potential approach. The calculated line strengths are compared with the results of other theories. The M1 transition rates are reported using accurate energies from the literature. Moreover, the lifetimes in the range of millisecond to picoseconds are predicted including the contributions also from the transition rate due to the E2 transition channel. The discrepancies of the predicted rates from those available from the literature are discussed and a benchmark dataset of theoretical lifetimes is provided to support future experiments.

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Section: Resultsmentioning

confidence: 99%

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions

et al. 2018

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“…An experiment that was thought to be particularly clean, in an EBIT at the LCLS X-Ray light source, did not cut through the fog either [82], and the astrophysical interpretative struggle continued [83]. An attempt at measuring the two level lifetimes expected from theory (44 fs and 166 fs, respectively) unfortunately failed [84]. Further attempts continued to find the reasons for the line ratio being different from the theory for Ne-like ions, assuming, for example, nonlinear excitation dynamics or population transfers from adjacent charge state ions [85] (for further references, see [86]).…”

Section: Ne-like Fe XVIImentioning

confidence: 99%

Atomic Lifetimes of Astrophysical Interest in Ions of Fe

Träbert

2023

Atoms

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Multiple charged ions of iron dominate the EUV spectrum of the solar corona. For the interpretation of such spectra, data on both the atomic structure and the transition rate are essential, most of which are provided by theory and computation. The wavelengths of observed spectra are used to test the predicted energy level structure, while the line intensities depend on level lifetimes and branch fractions. A number of electric dipole and higher-order transition rates have been measured over the years in the laboratory, mostly by beam-foil spectroscopy, at heavy-ion storage rings, and at various ion traps. In this paper, the state of the knowledge base on level lifetimes in all ions of Fe is assessed, and the problems of further progress are outlined.

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“…HCI光谱是了解天体物质成分、离子所处天体的等离子体环境状态等关键参数最直接甚至是唯一的手段, 对于理解和发展天体物理和宇宙模型必不可少 [3] . HCI的光电离截面、光吸收截面、能级寿命、跃迁速率等基本参数, 对于研究从太阳日冕到星系中心黑洞周围的吸积盘等天体物理中等离子体的密度、温度等特性具有重要意义 [4,5] . 目前对于低价离子的光电离实验数据和理论模型计算结果符合比较好, 但对于高价HCI离子, 理论计算与实验测量值偏差较大, 需要大量高精度的绝对光电离截面测量数据来验证及修正相关理论模型 [6,7] .…”

Section: 引言unclassified

Prospect for attosecond laser spectra of highly charged ions

Zhang,

Ge,

et al. 2023

Acta Phys. Sin.

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The spectroscopy of highly charged ions (HCI) is of great significance for astronomical observation, astrophysical model establishment, and test of quantum electrodynamics (QED) theory. However, the transitions of HCI are mostly in the extreme ultraviolet or even X-ray range, the excitation spectra of HCI measured by laser spectroscopy in laboratory are very limited due to lack of the suited light source. Up to now, only few experiments on spectroscopy of HCIs performed on synchrotron radiation, free electron laser or heavy-ions storage ring were reported, which are summarized in this work. With development of attosecond technology, several attosecond light source facilities such as Extreme Light Infrastructure Attosecond Light Pulse Source (ELI-ALPS), Synergetic Extreme Condition User Facility (SECUF) have been constructed, which provide a new opportunity for the study of HCI spectroscopy and ultra-short lifetime of energy level in laboratory for its high photon energies and ultra-short pulse durations in the extreme ultraviolet and even soft X-ray range. Electron Beam Ion Traps (EBIT), Electron Cyclotron Resonance (ECR), and heavy-ion storage ring are usually used to generate ions target. But it is difficult to combine the attosecond laser source with large scale facility of HCI for there is not a laboratory have both these two facilities now. Thus, two possible experimental schemes for attosecond spectroscopy of HCIs are proposed in this work. One scheme is that an EBIT can be designed as one terminal of attosecond laser facility, such as ELI-ALPS, SECUF, which can output different laser beams with high photon energy, ultra-short pulse duration or high flux. Another scheme is that a table-top HHG system pumped by all-solid-state femtosecond laser or fibers femtosecond laser with high power can be combined with heavy-ion storage ring, such as ESR, CSRe, HIAF and FAIR. Thanks to high energy of ions in storage ring, the measurable energy levels of HCIs can even be extended to keV by the Doppler shift. Three different measurement methods:fluorescence detection, ions detection and attosecond absorption spectroscopy can be used to obtain the HCI spectroscopy. Finally, a preliminary experimental setup for attosecond laser spectroscopy of HCI is proposed. The proposal on combining extreme ultraviolet attosecond light source with HCI targets is discussed, and the feasibility of attosecond time-resolved precision spectral for HCI is analyzed according to the typical parameters of attosecond light sources and the known excitation cross-sections and detection efficiency, which can provide a new platform for ion level structure calculation, QED theory high-precision test and astronomical spectroscopic observation. It can be used to measure the ultra-short lifetime, low excitation cross-section ionic energy level, and even some transitions with large energy interval. We hope this work can provide a reference for experiments of HCI spectroscopy and ion energy level lifetime measurement in future.

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Measurement of femtosecond atomic lifetimes using ion traps

Cited by 9 publications

References 24 publications

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions

Atomic Lifetimes of Astrophysical Interest in Ions of Fe

Prospect for attosecond laser spectra of highly charged ions

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