Lifetime determination of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mspace width="0.2em" /><mml:mn mathsize="8pt">XIV</mml:mn></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>3</mml:mn><mml:msup><mml:mi>s</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mn>3</mml:mn><mml:mi>p</mml:mi><mml:mspace width="0.2em" /><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mrow><mm

Brenner, Günter; López‐Urrutia, J. R. Crespo; Harman, Z.; Mokler, P. H.; Ullrich, J.

doi:10.1103/physreva.75.032504

Cited by 52 publications

(51 citation statements)

References 24 publications

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“…As a result, Tayal (2008) finds a thermally averaged collision strength for the 3s 2 3p 2 P o 3/2 → 3s 2 3p 2 P o 1/2 transition which is 20% smaller than that reported by Storey et al (1996) at 2 × 10 6 K, the temperature of maximum abundance of Fe 13+ in the solar corona. In addition, a high-accuracy measurement of the lifetime of the metastable state has been made (16.726 +0.020 −0.010 ms) at the Heidelberg EBIT (Brenner et al 2007). The incorporation of these new data into the collisional-radiative (CR) model may resolve some of the remaining discrepancies between theory and astrophysical observations.…”

Section: Introductionmentioning

confidence: 99%

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

Liang¹,

Badnell²,

López‐Urrutia³

et al. 2010

ApJS

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Accurate excitation parameters are required to interpret the ultraviolet and X-ray spectra of Fe 13+ . In this work, we use the autostructure code to describe the atomic structure of Fe 13+ . The 197 lowest-lying fine-structure levels of the 3sx 3p y 3d z (x + y + z = 3), 3s 2 4l, and 3s3p4{s, p, and d} configurations are included along with further correlation configurations: 3s3p4f , 3px 3d y 4l (x + y = 2), 3l4l 4l , and 3l3l 5l . The resultant level energies, lifetimes of excited states, and oscillator strengths of transitions between these levels are assessed by comparison with available experimental data and previous calculations. Electron-impact excitation data among these lowestlying levels are generated using the intermediate-coupling frame transformation R-matrix method. We assess the present results by comparisons with laboratory measurement for the excitation to the metastable level 3s 2 3p 2 P o 3/2 and with available close-coupling calculations for other excitations. Using these data and a collisional-radiative model, we have analyzed soft X-ray and extreme-ultraviolet spectra from space satellite observations of a stellar corona and of solar flares, as well as measurements from an electron beam ion trap. We assess the contribution from Fe 13+ emission lines in the solar and Procyon corona observations, and find and identify new lines in the X-ray region observed in the solar and Procyon coronae. The laboratory measurements also confirm that weak lines (218.177 Å and 224.354 Å) of Fe 13+ contribute to the observed intensities in solar observations. The polarization effect due to the directional monoenergetic distribution of the electron energy has been taken into account in comparison with the laboratory measurements. Electron density diagnostics for the astrophysical plasma sources have been performed using the updated data so as to investigate their sensitivity to the atomic data source.

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Section: Introductionmentioning

confidence: 99%

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

Liang¹,

Badnell²,

López‐Urrutia³

et al. 2010

ApJS

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“…The likely influence of this cascade is a lengthening of the apparent lifetime, and the effect would be most pronounced in an environment in which the cascade level is more highly populated. Such a pattern is, in fact, apparent in the experimental data [200][201][202][203][204][205], as has been discussed in more detail elsewhere [12]. In Fe XIV the cascade lifetime (calculated by FAC [185] and MR-MP codes) is too close to the primary to be discerned in the decay curve of the 3s 2 3p 2 P o 3/2 level.…”

Section: Al-like Ionsmentioning

confidence: 70%

“…The cascade contribution is smallest in the excellent vacuum of an EBIT, but not really negligible. The most accurate lifetime measurement on Fe XIV [205] is, indeed, on the slow side of theoretical expectation, as would be in the (neglected) presence of the cascade. To repeat a point mentioned above: There also is a need to take the EAMM correction to the M1 transition moment into account, and when one does that, the disagreement of the lifetime measurement result with theory increases and actually becomes quite sizeable (see Figure 11).…”

Section: Al-like Ionsmentioning

confidence: 96%

Critical Assessment of Theoretical Calculations of Atomic Structure and Transition Probabilities: An Experimenter’s View

Trabert

2014

Atoms

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The interpretation of atomic observations by theory and the testing of computational predictions by experiment are interactive processes. It is necessary to gain experience with "the other side" before claims of achievement can be validated and judged. The discussion covers some general problems in the field as well as many specific examples, mostly organized by isoelectronic sequence, of what level of accuracy recently has been reached or which atomic structure or level lifetime problem needs more attention.

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“…Higher photon energies will not only allow for resonant excitation of fundamental ground state transitions as 1S-nP in H-like ions aiming at the 1S Lamb-shift, but also for photoionization experiments in HCI. Moreover, the short FEL pulses make femtosecond-scale lifetime studies possible [91,92] by pump-probe schemes using one or two-colour schemes. Steep scaling laws as a function of Z for the lifetimes of levels depopulated by multipole transitions (M1, E2, 2E1, M2...) facilitates those studies with HCI.…”

Section: Discussionmentioning

confidence: 99%

X-ray laser spectroscopy of highly charged ions at FLASH

Epp

López‐Urrutia

Simon

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. Laser spectroscopy, widely applied in physics and chemistry, is extended into the soft x-ray region for the first time. Resonant fluorescence excitation of highly charged ions (HCI) by soft x-ray free-electron lasers shows here the potential for unprecedented precision on photonic transitions hitherto out of reach. The novel experiments combine an electron beam ion trap (EBIT) with the Free-electron LASer at Hamburg (FLASH) to measure resonant fluorescence by trapped HCI as a function of the wavelength. The present experiments reach already the performance of conventional soft and hard X-ray spectroscopy. We present the results obtained for three fundamental and theoretically challenging transitions in Li-like ions, namely 1s 2 2s 2 S 1/2 -1s 2 2p 2 P 1/2 in Fe 23+ at 48.6 eV, in Cu 27+ at 55.2 eV, and 1s 2 2s 2 S 1/2 -1s 2 2p 2 P 3/2 in Fe 23+ at 65.3 eV. The latter demonstrates laser spectroscopy of multiply or highly charged ions at more than one order of magnitude higher energies than hitherto reported. Resolving power leading to relative precision up to 6 parts-per-million points to the possibility of providing an atomic absolute wavelength standards in this spectral region, which is still lacking.

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Lifetime determination of theFeXIV3s23pP

Cited by 52 publications

References 24 publications

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

Critical Assessment of Theoretical Calculations of Atomic Structure and Transition Probabilities: An Experimenter’s View

X-ray laser spectroscopy of highly charged ions at FLASH

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Lifetime determination of theFeXIV3s23pP

Cited by 52 publications

References 24 publications

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe 13+ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe 13+ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

Critical Assessment of Theoretical Calculations of Atomic Structure and Transition Probabilities: An Experimenter’s View

X-ray laser spectroscopy of highly charged ions at FLASH

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Product

Resources

About

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS

R -MATRIX ELECTRON-IMPACT EXCITATION OF Fe ¹³⁺ AND ITS APPLICATION TO THE SOFT X-RAY AND EXTREME-ULTRAVIOLET SPECTROSCOPY OF CORONA-LIKE PLASMAS