Measurement of level-specific dielectronic-recombination cross sections of heliumlike Fe xxv

Beiersdörfer, P.; Phillips, T. W.; Wong, K. L.; Marrs, R. E.; Vogel, D. A.

doi:10.1103/physreva.46.3812

Cited by 146 publications

(111 citation statements)

References 42 publications

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“…Dielectronic recombination with two-electron ion of Fe was studied experimentally and theoretically in work [1]. Measurements of the radiative and Auger decay rates for K-shell vacancies in highly charged Fe ions were presented in [2].…”

Section: Introductionmentioning

confidence: 99%

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Lyashchenko

Andreev

2016

Phys. Rev. A

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Section: Introductionmentioning

confidence: 99%

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Lyashchenko

Andreev

2016

Phys. Rev. A

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“…There are two possible meanings of "beam temperature": (1) overall beam temperature, or full energy spread, and (b) transverse beam temperature. Regarding the first, the paper cited by LLNL in [15] concerning this issue determined their beam temperature to be 50 eV [22], larger than the 45 eV value determined previously for the NIST EBIT [23]. The actual value for the NIST EBIT during the Fe XVII experiment is likely to have been even less since we operated at reduced beam currents (one component of the temperature is proportional to the space charge, which scales linearly with beam current).…”

Section: X-ray Microcalorimetrymentioning

confidence: 71%

Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility

Gillaspy¹

2004

AIP Conference Proceedings

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After a brief introduction to the NIST EBIT facility, we present the results of three different types of experiments that have been carried out there recently: EUV and visible spectroscopy in support of the microelectronics industry, laboratory astrophysics using an x-ray microcalorimeter, and charge exchange studies using extracted beams of highly charged ions. THE NIST EBIT FACILITY: HISTORY AND OVERVIEWElectron Beam Ion Traps (EBITs) emerged on the world scene in 1988 with the publication of the first results by the Livermore-LBL collaboration [1]. Results that depended critically on high-resolution x-ray spectroscopy with an EBIT appeared in the Physical Review in 1989 [2], using an NRL-NIST spectrometer at Livermore, in collaboration with P. Beiersdorfer. This work followed some other important EBIT high-resolution spectroscopy work presented earlier in various conference proceedings. Two years later, construction of a new EBIT laboratory at NIST began, in collaboration with NRL, and two years after that (1993) we began trapping ions and publishing papers from the NIST facility. A compilation of the early Livermore EBIT papers was published in 1992 [3]. Recently, we published a bound collection of the NIST EBIT publications through 2001, which is available in hardcopy and CD from NIST [4]. The NIST compilation also contains some previously unpublished historical information about both the NIST and LLNL EBITs (written by the first author of the present paper, and by Ross Marrs of LLNL).The NIST EBIT incorporates a number of design changes that are intended to allow it to reach higher beam energies than those obtained in the EBIT-I and EBIT-II at

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“…In particular, the radiationless electron capture processes, which is the firststep in the dielectronic recombination process that often plays the dominant role in the formation of the Kα spectra in high-temperature plasmas, can occur in electron-ion beam interactions only for resonant (or nearly-resonant) values of the incident electron-beam energy. While the dielectronic satellite spectra have been observed with high-resolution in EBIT experiments [14] in which the incident electron energy was varied either in a stepwise or in a continuous manner through the resonant region, the present work focuses on EBIT measurements performed for non-resonant values of the incident electron energy, which were either below or above the K-shell ionization threshold of Fe XXIV (8.7 keV).…”

Section: Spectral Intensity Due To Kα α α α Radiative Emissionmentioning

confidence: 99%

“…In the Livermore EBIT facility, extreme non-equilibrium conditions have been achieved. The appropriate electron velocity distribution function f ε (v ε ) then represents a nearly mono-energetic distribution, with an energy spread of only about 50 eV [14,15]. Consequently, the radiative emission spectra are expected to be more sensitive to the detailed energy variations of the individual electron-ion collision cross sections and to the associated energy-conservation restrictions.…”

Section: Spectral Intensity Due To Kα α α α Radiative Emissionmentioning

confidence: 99%

“…Since the electron beam in EBIT is nearly mono-energetic, a precise investigation of the various fundamental Kα radiative emission processes can be carried out. In order to observe the contributions from the dielectronic recombination satellites, which are produced by radiationless electron capture, it has been necessary to set the electron-beam energy at a particular resonance position [14] or to vary the electron-beam energy in a continuous manner through the resonance region [15]. We discuss the observed and theoretically predicted Fe Kα radiative emission spectra for two different non-resonant electron-beam energies, which occur above and below the K-shell ionization threshold.…”

Section: Fementioning

confidence: 99%

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Kα X-ray emission spectra from highly charged Fe ions in EBIT

Jacobs¹,

Beiersdörfer²

2008

Can. J. Phys.

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A detailed spectral model has been developed for the computer simulation of the 2p→1s Kα X-ray emission from highly charged Fe ions in the Electron Beam Ion Trap (EBIT). The spectral features of interest occur in the range from 1.84 Å to 1.94 Å. The fundamental radiative emission processes associated with radiationless electron capture or dielectronic recombination, inner-shell electron collisional excitation, and inner-shell electron collisional ionization are taken in account. For comparison, spectral observations and simulations for high-temperature magnetic-fusion (Tokamak) plasmas are reviewed.In these plasmas, small departures from steady-state corona-model charge-state distributions can occur due to ion transport processes, while the assumption of equilibrium (Maxwellian) electron energy distributions is expected to be valid. Our investigations for EBIT have been directed at the identification of spectral features that can serve as diagnostics of extreme non-equilibrium or transient-ionization conditions, and allowance has been made for general (non-Maxwellian) electron energy distributions. For the precise interpretation of the high-resolution X-ray observations, which may involve the analysis of blended spectral features composed of many lines, it has been necessary to take into account the multitude of individual fine-structure components of the Kα radiative transitions in the ions from Fe XVIII to Fe XXV. At electron densities higher than the validity range of the corona-model approximation, collisionally induced transitions among low-lying excited states can play an important role. It is found that inner-shell electron excitation and ionization processes involving the complex intermediate

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Measurement of level-specific dielectronic-recombination cross sections of heliumlike Fe xxv

Cited by 146 publications

References 42 publications

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Calculation of differential cross section for dielectronic recombination with two-electron uranium

Visible, EUV, and X-ray Spectroscopy at the NIST EBIT Facility

Kα X-ray emission spectra from highly charged Fe ions in EBIT

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