Soft-X-ray spectra of highly charged Au ions in an electron-beam ion trap

2001 ◽  
Vol 79 (2-3) ◽  
pp. 153-162 ◽  
Author(s):  
E Träbert ◽  
P Beiersdorfer ◽  
K B Fournier ◽  
S B Utter ◽  
K L Wong
Keyword(s):  
Electron Beam ◽  
Beam Energy ◽  
Large Scale ◽  
Ion Trap ◽  
Electron Beam Energy ◽  
X Ray ◽  
Maximum Charge ◽  
Electron Beam Ion Trap ◽  
Atomic Structure Calculations ◽  
Structure Calculations

Systematic variation of the electron-beam energy in an electron-beam ion trap has been employed to produce soft-X-ray spectra (20 to 60 Å) of Au with well-defined maximum charge states ranging from Br- to Co-like ions. Guided by large-scale relativistic atomic structure calculations, the strongest Δn = 0 (n = 4 to n' = 4) transitions in Rb- to Cu-like ions (Au42+ – Au50+) have been identified. PACS Nos.: 32.30Rj, 39.30+w, 31.50+w, 32.20R

scholarly journals Soft-X-ray spectra of highly charged Os, Bi, Th, and U ions in an electron beam ion trap

2005 ◽  
Vol 83 (8) ◽  
pp. 829-840 ◽  
Author(s):  
E Träbert ◽  
P Beiersdorfer ◽  
K B Fournier ◽  
M H Chen
Keyword(s):  
Electron Beam ◽  
Atomic Structure ◽  
Beam Energy ◽  
Ion Trap ◽  
Electron Beam Energy ◽  
Valence Shell ◽  
X Ray ◽  
Electron Beam Ion Trap ◽  
Atomic Structure Calculations ◽  
Structure Calculations

Systematic variation of the electron-beam energy in an electron-beam ion trap has been employed to produce soft-X-ray spectra of Os, Bi, Th, and U with the highest charge states ranging up to Ni-like ions. Guided by relativistic atomic structure calculations, the strongest lines have been identified with Δn = 0 (n = 4 to n′ = 4) transitions in Rb- to Cu-like ions. The rather weak 4p–4d transitions are much less affected by QED contributions than the dominant 4s–4p transitions. Our wavelength measurements consequently provide benchmarks with and (almost) without QED. Because the radiative corrections are not very sensitive to the number of electrons in the valence shell, our data, moreover, provide benchmarks for the evaluation of electron–electron interactions. PACS Nos.: 32.30.Rj, 39.30.+w, 31.50.+w

Electron-beam ion-trap spectra of tungsten in the EUV

2002 ◽  
Vol 80 (12) ◽  
pp. 1503-1515 ◽  
Author(s):  
S B Utter ◽  
P Beiersdorfer ◽  
E Träbert
Keyword(s):  
Electron Beam ◽  
Wavelength Range ◽  
Beam Energy ◽  
Ion Trap ◽  
Extreme Ultraviolet ◽  
Spectral Features ◽  
Electron Beam Energy ◽  
Ultraviolet Spectra ◽  
Electron Beam Ion Trap ◽  
The Individual

At the Livermore electron-beam ion-trap facility, extreme-ultraviolet spectra of tungsten have been recorded in the wavelength range 40–85 Å. The electron-beam energy was varied systematically to identify the individual spectra of Rb-like W37+ to Cu-like W45+. About 60 spectral features have been identified. PACS Nos.: 32.30Rj, 39.30+w, 31.50+w

scholarly journals Measurements of L‐shell X‐ray emission lines of neonlike europium on an electron beam ion trap

2019 ◽  
Vol 49 (1) ◽  
pp. 21-24 ◽  
Author(s):  
Peter Beiersdorfer ◽  
Natalie Hell ◽  
Dmytro Panchenko ◽  
Greg V. Brown ◽  
Elmar Träbert ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
Emission Lines ◽  
X Ray ◽  
Electron Beam Ion Trap

scholarly journals A brief review of the intensity of lines 3C and 3D in neon-like Fe XVII

2008 ◽  
Vol 86 (1) ◽  
pp. 199-208 ◽  
Author(s):  
G V Brown
Keyword(s):  
Electron Beam ◽  
Cross Sections ◽  
Ion Trap ◽  
Diagnostic Utility ◽  
The Sun ◽  
Model Calculations ◽  
Atomic Theory ◽  
X Ray ◽  
Electron Beam Ion Trap ◽  
Intercombination Line

X-ray emission from neon-like Fe XVII has been measured with high-resolution spectrometers from laboratory or celestial sources for nearly seven decades. Two of the strongest lines regularly identified in these spectra are the 1P1 → 1S0 resonance and the 3D1 → 1S0 intercombination line, known as 3C and 3D, respectively. This paper gives a brief overview of measurements of the intensities of the lines 3C and 3D from laboratory and celestial sources and their comparison to model calculations, with an emphasis on measurements completed using an electron beam ion trap. It includes a discussion of the measured absolute cross sections compared with results from modern atomic theory calculations as well as the diagnostic utility of the relative intensity, R = I3C/I3CD, as it applies to the interpretation of spectra measured from the Sun and extra-solar sources. PACS Nos.: 32.30.Rj, 32.30.–r, 32.70.Cs, 52.72.+v, 95.85.Nv, 96.60.P–, 97.10.Ex

X-ray spectroscopy and spectropolarimetry of high energy density plasma complemented by LLNL electron beam ion trap experiments

2003 ◽  
Vol 74 (3) ◽  
pp. 1947-1950 ◽  
Author(s):  
A. S. Shlyaptseva ◽  
D. A. Fedin ◽  
S. M. Hamasha ◽  
S. B. Hansen ◽  
C. Harris ◽  
...  
Keyword(s):  
Electron Beam ◽  
Energy Density ◽  
Ion Trap ◽  
High Energy ◽  
High Energy Density ◽  
X Ray ◽  
Electron Beam Ion Trap ◽  
Density Plasma

Wide-band, high-resolution soft x-ray spectrometer for the Electron Beam Ion Trap

1999 ◽  
Vol 70 (1) ◽  
pp. 280-283 ◽  
Author(s):  
G. V. Brown ◽  
P. Beiersdorfer ◽  
K. Widmann
Keyword(s):  
Electron Beam ◽  
High Resolution ◽  
Ion Trap ◽  
Wide Band ◽  
X Ray ◽  
Electron Beam Ion Trap

Absolute calibration of an x-ray spectrometer on the NIST electron-beam ion trap: control, design and systematics

1997 ◽  
Vol T73 ◽  
pp. 400-402 ◽  
Author(s):  
D Paterson ◽  
C T Chantler ◽  
C Q Tran ◽  
L T Hudson ◽  
F G Serpa ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
Control Design ◽  
Absolute Calibration ◽  
X Ray ◽  
Electron Beam Ion Trap

X-ray measurement of the ionization balance in an electron beam ion trap

1992 ◽  
Vol 72 (2) ◽  
pp. 234-238 ◽  
Author(s):  
K.L. Wong ◽  
P. Beiersdorfer ◽  
R.E. Marrs ◽  
B.M. Penetrante ◽  
K.J. Reed ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
X Ray ◽  
Electron Beam Ion Trap ◽  
Ionization Balance

A Universal Equation for the Emission Range of X Rays from Bulk Specimens

2007 ◽  
Vol 13 (5) ◽  
pp. 354-357 ◽  
Author(s):  
Raynald Gauvin
Keyword(s):  
Electron Beam ◽  
Free Path ◽  
Beam Energy ◽  
Mean Free Path ◽  
Electron Beam Energy ◽  
X Rays ◽  
Bulk Materials ◽  
Universal Equation ◽  
Electron Trajectories ◽  
X Ray

The derivation of a universal equation to compute the range of emitted X rays is presented for homogeneous bulk materials. This equation is based on two fundamental assumptions: the φ(ρz) curve of X-ray generation is constant and the ratio of the emitted to the generated X-ray range is equal to the ratio of the emitted to the generated X-ray intensity. An excellent agreement is observed with data obtained from Monte Carlo simulations of 200,000 electron trajectories in C, Al, Cu, Ag, Au, and an Fe–B alloy with boron weight fractions equal to 0.01, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 0.99, performed with the electron beam energy varied from 1 to 30 keV in 1-keV steps. When the ratio of the generated X-ray range to the photon mean free path is much smaller than one, the emission X-ray range is equal to the generated X-ray range, but when this ratio is much greater than one, the emission X-ray range is constant and is given by the product of the effective photon mean free path multiplied by the sine of the take-off angle.

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