scholarly journals Emission Lines in 290–360 nm of Highly Charged Tungsten Ions W20+–W29+

Atoms ◽  
2021 ◽  
Vol 9 (3) ◽  
pp. 63
Author(s):  
Shota Era ◽  
Daiji Kato ◽  
Hiroyuki A. Sakaue ◽  
Toshiki Umezaki ◽  
Nobuyuki Nakamura ◽  
...  
Keyword(s):  
Electron Beam ◽  
Excited States ◽  
Magnetic Dipole ◽  
Ion Trap ◽  
Emission Lines ◽  
Fusion Plasmas ◽  
Hartree Fock ◽  
Electron Beam Ion Trap ◽  
Forbidden Transitions ◽  
Good Agreement

Forbidden transitions in the near-UV and visible wavelength of highly charged tungsten (W) ions are potentially useful as novel tungsten diagnostics means of fusion plasmas. Emission lines in 290–360 nm from Wq+ ions interacting with an electron beam of 540–1370 eV are measured, using a compact electron-beam-ion-trap. The charge states of 64 lines are identified as W20+–W29+. A magnetic-dipole (M1) line of W29+ between the excited states (4d84f)[(4d5/2−2)44f7/2]13/2→[(4d5/2−2)44f5/2]13/2 is newly identified; the wavelength is determined as 351.03(10) nm in air. The theoretical wavelength calculated using the multiconfiguration Dirac–Hartree–Fock method is in a good agreement with the measurement.

Forbidden Transitions in the Visible Spectra of an Electron Beam Ion Trap (EBIT)

1998 ◽  
Vol 58 (6) ◽  
pp. 599-604 ◽  
Author(s):  
E Träbert ◽  
P Beiersdorfer ◽  
S B Utter ◽  
J R Crespo López-Urrutia
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
Electron Beam Ion Trap ◽  
Visible Spectra ◽  
Forbidden Transitions

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 Measurement of a magnetic-dipole transition probability inXe32+using an electron-beam ion trap

1997 ◽  
Vol 55 (6) ◽  
pp. 4196-4200 ◽  
Author(s):  
F. G. Serpa ◽  
C. A. Morgan ◽  
E. S. Meyer ◽  
J. D. Gillaspy ◽  
E. Träbert ◽  
...  
Keyword(s):  
Electron Beam ◽  
Magnetic Dipole ◽  
Ion Trap ◽  
Transition Probability ◽  
Dipole Transition ◽  
Magnetic Dipole Transition ◽  
Electron Beam Ion Trap

Spectroscopic analysis of M- and N-intrashell transitions in Co-like to Na-like Yb ions

2021 ◽  
Author(s):  
Roshani Silwal ◽  
Dipti Dipti ◽  
Endre Takacs ◽  
Joan M. Dreiling ◽  
Samuel C Sanders ◽  
...  
Keyword(s):  
Electron Beam ◽  
Magnetic Dipole ◽  
Large Scale ◽  
Ion Trap ◽  
Extreme Ultraviolet ◽  
Wavelength Region ◽  
Grazing Incidence ◽  
Spectral Lines ◽  
Electron Beam Ion Trap ◽  
Large Scale Simulations

Abstract The M-intrashell spectra from Co-like Yb43+ through Na-like Yb59+ ions produced in an electron beam ion trap (EBIT) at the National Institute of Standards and Technology have been studied in the extreme ultraviolet (EUV) range. A few N-intrashell transitions for Co-like Yb43+ and Fe-like Yb44+ are also reported. The EUV radiation was observed with a flat-field grazing incidence spectrometer in the wavelength region of about 7.5 nm to 26.2 nm. The electron beam energies were varied between 3.6 keV and 18 keV to produce the ionization stages of interest. The line identifications were based on the large-scale simulations of the EBIT plasma emission using the non-Maxwellian collisional-radiative code NOMAD. A total of 76 previously unobserved spectral lines corresponding to electric-dipole and magnetic-dipole transitions in the above mentioned ions were identified and discussed. In particular, our accurate wavelength of 24.3855±0.0005 nm for a magnetic-dipole (M1) transition in the ground configuration of Co-like ion presents a solid benchmark for comparisons with the most advanced theories of atomic structure.

Absolute wavelength measurement of the Lyman-α transition of hydrogen-like silicon

2002 ◽  
Vol 80 (8) ◽  
pp. 867-874 ◽  
Author(s):  
J Tschischgale ◽  
D Klöpfel ◽  
P Beiersdorfer ◽  
G V Brown ◽  
E Förster ◽  
...  
Keyword(s):  
Electron Beam ◽  
Lamb Shift ◽  
Ion Trap ◽  
Wavelength Measurement ◽  
Electron Beam Ion Trap ◽  
Absolute Measurements ◽  
Good Agreement

The wavelengths of the 1s1/2–2p1/2 and 1s1/2–2p3/2 Lyman-α transitions have been measured in hydrogenic silicon with an accuracy of 70 ppm. The measurement was carried out with an electron-beam ion trap with a calibrated double-faced monolithic crystal that enabled absolute measurements of the transition wavelengths. The values for the Lyman-α wavelengths are λLyα1 = 6.180 49(44) Å and λLyα2 = 6.185 56(66) Å. The wavelengths are in good agreement with calculations and allow a determination of the 1s Lamb shift to within 28% in a region that has received little experimental attention. PACS Nos.:32.30Rj, 31.30Jv

Calculation of Wavelengths, Transition Probabilities and Oscillator Strengths for E1 and M1 Transitions in Cu-Like Au Ion

2015 ◽  
Vol 723 ◽  
pp. 799-803
Author(s):  
Min Xu
Keyword(s):  
Excited States ◽  
Magnetic Dipole ◽  
Configuration Interaction ◽  
Electric Dipole ◽  
Transition Probabilities ◽  
Energy Levels ◽  
Oscillator Strengths ◽  
Forbidden Transitions ◽  
Calculation Results ◽  
Good Agreement

Wavelengths, transition probabilities and oscillator strengths have been calculated for electric dipole (E1) transitions and magnetic dipole (M1) transitions in Cu-like Au ion. These values are obtained in the configuration interaction (CI) and using the fully relativistic multiconfiguration Dirac-Fock (MCDF) method including quantum electrodynamical (QED) effect and Breit correction. Obtained energy levels of some excited states in Cu-like Au ion from the method are generally in good agreement with valuable theoretical and experimental results. The calculation results indicate that for high-Z highly ionized atom, some forbidden transitions are very important.

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

Measurements of Temperature Dynamics of Ions Trapped Inside an Electron Beam Ion Trap and Evidence for Ionisation Heating

2001 ◽  
Vol T92 (1) ◽  
pp. 147-149 ◽  
Author(s):  
F. J. Currell ◽  
F. J. Currell ◽  
H. Kuramoto ◽  
S. Ohtani ◽  
C. Scullion ◽  
...  
Keyword(s):  
Electron Beam ◽  
Ion Trap ◽  
Electron Beam Ion Trap ◽  
Temperature Dynamics
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