Spectra of Ga-Like to Cu-Like Praseodymium and Neodymium Ions Observed in the Large Helical Device

Extreme ultraviolet (EUV) spectra of highly charged praseodymium (Pr) and neodymium (Nd) ions have been investigated in optically thin high-temperature plasmas produced in the Large Helical Device (LHD), a magnetically confined torus device for fusion research. Discrete spectral lines emitted mainly from highly charged ions having 4s or 4p outermost electrons were observed in plasmas with electron temperatures of 0.8–1.8 keV. Most of the isolated lines of Ga-like to Cu-like Nd ions were identified by a comparison with the recent data recorded in an electron beam ion trap (EBIT). The isolated lines of Pr ions corresponding to the identified lines of Nd ions were easily assigned from a similarity of the spectral feature for these two elements. As a result, some of the lines of Pr ions have been newly identified experimentally for the first time in this study.

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

Journal of Physics B Atomic Molecular and Optical Physics ◽

10.1088/1361-6455/ac44e1 ◽

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.

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Atomic lifetime measurements employing an electron beam ion trap

Canadian Journal of Physics ◽

10.1139/p07-099 ◽

2008 ◽

Vol 86 (1) ◽

pp. 73-97 ◽

Cited By ~ 20

Author(s):

E Träbert

Keyword(s):

Electron Beam ◽

Ion Trap ◽

Extreme Ultraviolet ◽

Transition Probabilities ◽

State Of The Art ◽

Fundamental Physics ◽

X Ray ◽

Structure And Dynamics ◽

Electron Beam Ion Trap ◽

Charged Ions

Transition probabilities relate to atomic structure and dynamics in ways that are different from straightforward spectra. Besides being a tool for fundamental physics studies, the knowledge of transition probabilities is essential for applications in plasma physics and astrophysics. Techniques and procedures used for measuring the lifetimes of levels in highly charged ions by employing an electron beam ion trap are reviewed to illustrate the state of the art. Examples are drawn from experiments that involve observations in the visible, extreme-ultraviolet, and X-ray ranges, and cover atomic lifetimes in the femtosecond to second range.PACS Nos.: 32.70.Cs, 32.30.Jc, 32.30.Rj

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Measurements of the effective electron density in an electron beam ion trap using extreme ultraviolet spectra and optical imaging

Review of Scientific Instruments ◽

10.1063/1.5036758 ◽

2018 ◽

Vol 89 (10) ◽

pp. 10E119 ◽

Cited By ~ 1

Author(s):

T. P. Arthanayaka ◽

P. Beiersdorfer ◽

G. V. Brown ◽

M. Hahn ◽

N. Hell ◽

...

Keyword(s):

Electron Beam ◽

Optical Imaging ◽

Electron Density ◽

Ion Trap ◽

Extreme Ultraviolet ◽

Effective Electron ◽

Ultraviolet Spectra ◽

Electron Beam Ion Trap

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Electron energy dependence of extreme ultraviolet spectra from highly charged tungsten ions in an electron beam ion trap

Journal of Physics Conference Series ◽

10.1088/1742-6596/388/6/062017 ◽

2012 ◽

Vol 388 (6) ◽

pp. 062017

Author(s):

H Ohashi ◽

J Yatsurugi ◽

N Nakamura ◽

H A Sakaue ◽

T Nakano

Keyword(s):

Electron Beam ◽

Electron Energy ◽

Energy Dependence ◽

Ion Trap ◽

Extreme Ultraviolet ◽

Ultraviolet Spectra ◽

Electron Beam Ion Trap

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Emission Spectroscopy of Highly Charged Ions in Plasma of an Electron Beam Ion Trap

10.1063/1.1843520 ◽

2004 ◽

Cited By ~ 1

Author(s):

I. Draganić

Keyword(s):

Electron Beam ◽

Emission Spectroscopy ◽

Ion Trap ◽

Highly Charged Ions ◽

Electron Beam Ion Trap ◽

Charged Ions

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Atomic physics of highly charged ions in an electron beam ion trap

10.1063/1.40973 ◽

1991 ◽

Author(s):

R. E. Marrs

Keyword(s):

Electron Beam ◽

Atomic Physics ◽

Ion Trap ◽

Highly Charged Ions ◽

Electron Beam Ion Trap ◽

Charged Ions

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K-shell transitions in L-shell ions with the EBIT calorimeter spectrometer

Proceedings of the International Astronomical Union ◽

10.1017/s1743921316003082 ◽

2015 ◽

Vol 11 (A29A) ◽

pp. 295-296

Author(s):

Natalie Hell ◽

Greg V. Brown ◽

Jörn Wilms ◽

Peter Beiersdorfer ◽

Richard L. Kelley ◽

...

Keyword(s):

Ion Trap ◽

Effective Area ◽

Spectral Lines ◽

X Ray ◽

Electron Beam Ion Trap ◽

Lower Charge ◽

Extended Sources ◽

Good Signal ◽

First Time ◽

Large Improvement

AbstractWith the large improvement in effective area of Astro-H's micro-calorimeter soft X-ray spectrometer (SXS) over grating spectrometers, high-resolution X-ray spectroscopy with good signal to noise will become more commonly available, also for faint and extended sources. This will result in a range of spectral lines being resolved for the first time in celestial sources, especially in the Fe region. However, a large number of X-ray line energies in the atomic databases are known to a lesser accuracy than that expected for Astro-H/SXS, or have no known uncertainty at all. To benchmark the available calculations, we have therefore started to measure reference energies of K-shell transition in L-shell ions for astrophysically relevant elements in the range 11≤ Z ≤ 28 (Na to Ni), using the Lawrence Livermore National Laboratory's EBIT-I electron beam ion trap coupled with the NASA/GSFC EBIT calorimeter spectrometer (ECS). The ECS has a resolution of ~5 e V, i.e., similar to Astro-H/SXS and Chandra/HETG. A comparison to crystal spectra of lower charge states of sulfur with ~0.6 e V resolution shows that the analysis of spectra taken at ECS resolution allows to determine the transition energies of the strongest components.

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