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Overall response function of our spectrometric equipment as derived from observed and calculated line intensities (I obs and I calc ) of Ne II, Ne III and Ne IV, assuming Boltzmann level populations with different effective temperatures (see text). The smooth curve is a fit with a fourth-degree polynomial. The lines originating from the 2s2p 4 configuration of Ne IV (squares) were excluded from the fitting.
Source publication
Spectra of Ne emitted by a Penning discharge were recorded in the extreme ultraviolet region between 140 and 359 Å on a 10.7 m grazing-incidence spectrograph with phosphor storage image plates. These spectra provided 33 newly identified lines of Ne IV and improved measurements of an additional 58 lines in this spectral region. In addition, 42 lines...
Context in source publication
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... spectral response function of our spectrometric equipment (a grazing incidence spectrograph with phosphor image plates), derived in this way, is shown in figure 1. The above-mentioned lines originating from the 2s2p 4 configuration of Ne IV (magenta squares) were excluded from the derivation of the response function. ...
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Citations
... Spectra emitted by yttrium ions were acquired in the approximate wavelength region of 4 nm to 20 nm. Wavelength calibration was performed using highly charged neon lines (Ne V-VIII), xenon lines (Xe XLI-XLII), barium lines (Ba XLIII-XLIV), oxygen lines (O V-VI) and iron lines (Fe XXIII-XXIV) [5,7,11,63,64], as described in this section. Neon and carbon dioxide gases were injected into the EBIT as neutral atoms from the gas injection setup described by Fahy et al. [2], with the injection pressure normally on the order of 10 −3 Pa. ...
Extreme ultraviolet spectra of the L-shell ions of highly charged yttrium (Y²⁶⁺-Y³⁶⁺) were observed in the electron beam ion trap of the National Institute of Standards and Technology using a flat-field grazing-incidence spectrometer in the wavelength range of 4 nm-20 nm. The electron beam energy was systematically varied from 2.3 keV-6.0 keV to selectively produce different ionization stages. Fifty-nine spectral lines corresponding to Dn = 0 transitions within the n = 2 and n = 3 shells have been identified using detailed collisional-radiative (CR) modeling of the non-Maxwellian plasma. The uncertainties of the wavelength determinations ranged between 0.0004 nm and 0.0020 nm. Li-like resonance lines, 2s-2p1/2 and 2s-2p3/2, and the Na-like D lines, 3s-3p1/2 and 3s-3p3/2, have been measured and compared with previous measurements and calculations. Forbidden magnetic dipole (M1) transitions were identified and analyzed for their potential applicability in plasma diagnostics using large-scale CR calculations including approximately 1.5 million transitions. Several line ratios were found to show strong dependence on electron density and, hence, may be implemented in the diagnostics of hot plasmas, in particular in fusion devices.
... It is important to mention that most of our results on the studied xenon, krypton, and argon gases were critically compiled and reported by E.B. Saloman [60][61][62] and an extension and new level optimization of the Ne IV spectrum, that includes our line identification on this gas, was recently made by A. Kramida [63]. Also our previous results a new Kr IV-VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503−289, and a new Zr IV-VII, Xe IV-V, and Xe VII oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191−B2B and RE 0503−289 were very recently reported [64,65]. ...
... It is important to mention that most of our results on the studied xenon, krypton, and argon gases were critically compiled and reported by E.B. Saloman [60][61][62] and an extension and new level optimization of the Ne IV spectrum, that includes our line identification on this gas, was recently made by A. Kramida [63]. Also our previous results a new Kr IV-VII oscillator strengths and an improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf RE 0503-289, and a new Zr IV-VII, Xe IV-V, and Xe VII oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE 0503-289 were very recently reported [64,65]. ...
This article presents a review concerning the spectral analysis of several ions of neon, argon, krypton and xenon, with impact on laser studies and astrophysics that were mainly carried out in our collaborative groups between Argentina and Brazil during many years. The spectra were recorded from the vacuum ultraviolet to infrared regions using pulsed discharges. Semi-empirical approaches with relativistic Hartree-Fock and Dirac-Fock calculations were also included in these investigations. The spectral analysis produced new classified lines and energy levels. Lifetimes and oscillator strengths were also calculated.
... The following sections summarize results obtained during the last six years for each of these activities. 1 To whom correspondence should be addressed. ...
... The following list enumerates the recent papers describing experimental work on light elements completed at NIST in the last six years: 1. Extension and new level optimization of the Ne IV spectrum [1]. 2. A critical compilation of experimental data on spectral lines and energy levels of hydrogen, deuterium, and tritium [2]. ...
This paper summarizes work at the National Institute of Standards and Technology (NIST) in support of the International Atomic Energy Agency (IAEA) Coordinated Research Project on "Light Element Atom, Molecule and Radical Behaviour in the Divertor and Edge Plasma Regions." It includes numerical data on radiative transition rates for ions of fluorine and neon critically compiled at NIST.
Please see Article PDF for corrigendum text.
Current methods of critical evaluation of wave-lengths, energy levels, and transition probabilities for atoms and atomic ions at the National Institute of Standards and Technology are summarized.
This report summarizes laboratory measurements of atomic wavelengths, energy
levels, hyperfine and isotope structure, energy level lifetimes, and oscillator
strengths. Theoretical calculations of lifetimes and oscillator strengths are
also included. The bibliography is limited to species of astrophysical
interest. Compilations of atomic data and internet databases are also included.
Papers are listed in the bibliography in alphabetical order, with a reference
number in the text. Comprehensive lists of references for atomic spectra can be
found in the NIST Atomic Spectra Bibliographic Databases
http://physics.nist.gov/asbib.
The atomic parameters–oscillator strengths, line strengths, radiative decay rates (AA), and lifetimes–for fine structure transitions of electric dipole (E1) type for the astrophysically abundant ion Ne IV are presented. The results include 868 fine structure levels with n≤n≤ 10, l≤l≤ 9, and 1/2≤J≤≤J≤ 19/2 of even and odd parities, and the corresponding 83,767 E1 transitions. The calculations were carried out using the relativistic Breit–Pauli R-matrix method in the close coupling approximation. The transitions have been identified spectroscopically using an algorithm based on quantum defect analysis and other criteria. The calculated energies agree with the 103 observed and identified energies to within 3% or better for most of the levels. Some larger differences are also noted. The AA-values show good to fair agreement with the very limited number of available transitions in the table compiled by NIST, but show very good agreement with the latest published multi-configuration Hartree–Fock calculations. The present transitions should be useful for diagnostics as well as for precise and complete spectral modeling in the soft X-ray to infra-red regions of astrophysical and laboratory plasmas.
