Precise atomic lifetime measurements with stored ion beams and ion traps

Träbert, E.

doi:10.1139/p02-123

Cited by 41 publications

(39 citation statements)

References 98 publications

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“…The OEOP x-ray satellites emitted from doubly excited states have been observed in laser-produced plasmas [3][4][5][6][7][8][9][10], ion-solid and ion-atom collisions [11][12][13], Z pinch experiments [14], laser-imploded microballoons [15,16], electron cyclotron ion source [17,18], tokamak [19], beam foil spectroscopy [20,21], and solar flares [22]. On the theoretical side, most of the previous data on OEOP transitions from doubly excited He-like ions are largely on nonrelativistic models, and relativistic calculations using various methods exist only for a few elements.…”

Section: Introductionmentioning

confidence: 99%

Radiative one- and two-electron transitions into the emptyKshell of He-like ions

Kadrekar

Natarajan

2011

Phys. Rev. A

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The branching ratios between the single and double electron radiative transitions to empty K shell in He-like ions with 2s2p configuration are evaluated for 15 ions with 4 Z 26 using fully relativistic multiconfiguration Dirac-Fock wavefunctions in the active space approximation. The effects of configuration interaction and Breit contributions on the transition parameters have been analyzed in detail. Though the influence of Breit interaction on the electric dipole allowed one-electron radiative transitions is negligible, it substantially changes the spinforbidden rates and the two-electron one-photon transition probabilities. Also, while the single electron transition rates are gauge independent, the correlated double-electron probabilities are found to be gauge sensitive. The probable uncertainties in the computed transition rates have been evaluated by considering the line strengths and the differences between the calculated and experimental transition energies as accuracy indicators. The present results are compared with other available experimental and theoretical data.

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Section: Introductionmentioning

confidence: 99%

Radiative one- and two-electron transitions into the emptyKshell of He-like ions

Kadrekar

Natarajan

2011

Phys. Rev. A

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“…Information on those experiments can be found in the review of Gillaspy [30]. More results obtained with this technique, which in most cases achieve a relative accuracy δτ/τ around 2%, but in some cases approach a value of 0.1% (in which case QED contributions to the transition probability become apparent), are reported by Träbert et al [31][32][33], Beiersdorfer et al [34], Lapierre et al [35,36], and Brenner et al [37]. An example of the application of this technique is illustrated on Fig.…”

Section: The Electron Beam Ion Trap Application To Visible Spectroscopymentioning

confidence: 90%

The visible spectrum of highly charged ions: A window to fundamental physics

López‐Urrutia¹

2008

Can. J. Phys.

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The observation of forbidden transitions in the visible range was the first experimental sign of the existence of highly charged ions in nature. Such lines can nowadays be excited in electron beam ion traps with excellent control of the ionic charge state, allowing their identification and precise determination of wavelengths and transition probabilities. The accuracy achieved in such experiments has been central to the study of nuclear size effects and quantum electrodynamic contributions, which are drastically magnified in highly charged ions, thus enabling the study of the underlying fundamental interactions in few-electron systems. At the same time, forbidden lines can be used to probe conditions in high temperature plasmas present in both astrophysical and laboratory environments.Résumé : L'observation de transitions interdites dans le visible a été le premier signe expérimental de l'existence d'ions hautement chargés dans la nature. Aujourd'hui, de telles lignes peuvent être excitées dans des pièges ioniques à faisceau d'électrons avec un excellent contrôle de la charge ionique, permettant leur identification et la détermination précise de leurs longueurs d'onde et de leurs probabilités de transition. La précision atteinte joue un rôle central dans l'étude des effets dus à la dimension du noyau et d'autres effets QED fondamentaux, qui sont significativement amplifiés dans les ions très chargés, permettant ainsi l'étude sous-jacente fondamentale des interactions dans les systèmes à peu d'électrons. Simultanément, les lignes interdites peuvent être utilisées pour sonder les conditions qui prévalent dans les plasmas de haute température présents en astrophysique et dans le laboratoire.[Traduit par la Rédaction]

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“…Measurements of the radiative decay rates of metastable levels using the Livermore electron beam ion traps are discussed by E. Träbert in this volume and in [9]. Many such measurements are made possible by the magnetic mode of operation [21].…”

Section: Transition Probabilitiesmentioning

confidence: 99%

“…Sim-ilarly, the beam-foil method allows measurements of the radiative rates of fast dipole-allowed transitions [8], while the electron beam ion trap approach allows to determine the radiative lifetime of long-lived metastable levels [9].…”

Section: Introductionmentioning

confidence: 99%

Highly Charged Ion Research at the Livermore Electron Beam Ion Traps

Beiersdörfer

2005

Phys. Scr.

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Spectroscopy performed with the three Livermore electron beam ion traps is reviewed, which is continuing and complementing the innumerable contributions to atomic physics provided over the years by heavy-ion accelerators. Numerous spectrometers were developed that cover the spectral bands from the visible to the hard x ray region. These enabled exhaustive line surveys useful for x-ray astrophysics and for systematic studies along iso-electronic sequences, such as the 4s-4p, 3s-3p, and 2s-2p transitions in ions of the Cu-I, Na-I, and Li-I sequences useful for studying QED and correlation effects as well as for precise determinations of atomic-nuclear interactions. They also enabled measurements of radiative transition probabilities of very long-lived (milli-and microseconds) and very short-live (femtosecond) levels. Because line excitation processes can be controlled by choice of the electron beam energy, the observed line intensities are used to infer cross sections for electron-impact excitation, dielectronic recombination, resonance excitation, and innershell ionization. These capabilities have recently been expanded to simulate x-ray emission from comets by charge exchange. Specific contributions to basic atomic physics, nuclear physics, and high-temperature diagnostics are illustrated.

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Precise atomic lifetime measurements with stored ion beams and ion traps

Cited by 41 publications

References 98 publications

Radiative one- and two-electron transitions into the emptyKshell of He-like ions

Radiative one- and two-electron transitions into the emptyKshell of He-like ions

The visible spectrum of highly charged ions: A window to fundamental physics

Highly Charged Ion Research at the Livermore Electron Beam Ion Traps

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