Wavelengths, Energy Levels, and Analysis of Neutral Atomic Chlorine (Cl i)

Radziemski, Leon J.; Kaufman, Victor

doi:10.1364/josa.59.000424

Cited by 207 publications

(80 citation statements)

References 13 publications

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“…(The program ELCALC was written by L. J. Radziemski of the Research Corporation, Tucson, Arizona 85712. The procedure and definition of level value uncertainties have been described by Radziemski and Kaufman [14].) For the level optimization only the most reliably classified lines were used.…”

Section: Spectrum Analysis and Level Valuesmentioning

confidence: 99%

Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V)

Reader

2016

Atoms

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Abstract:The analysis of the spectrum of four-times-ionized yttrium, Y V, was extended to provide a large number of new spectrum lines and energy levels. The new analysis is based on spectrograms made with sliding-spark discharges on 10.7 m normal-and grazing-incidence spectrographs. The measurements cover the region 184-2549 Å. The results revise levels for this spectrum by Zahid-Ali et al. (1975) and by Ateqad et al. (1984). Five hundred and seventy lines were classified as transitions between 23 odd-parity and 90 even-parity levels. The 4s 2 4p 5 , 4s4p 6 , 4s 2 4p 4 4d, 5s, 5p, 5d, 6s configurations are now complete. Results for the 4s 2 4p 4 6d and 7s configurations are tentative. Ritz-type wavelengths were determined from the optimized energy levels, with uncertainties as low as ±0.0004 Å. The observed configurations were interpreted with Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels. Oscillator strengths for all classified lines were calculated with the fitted parameters. The results are compared with values for the level energies, percentage compositions, and transition probabilities from recent ab initio theoretical calculations. The ionization energy was revised to 607,760 ± 300 cm −1 (75.353 ± 0.037 eV).

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Section: Spectrum Analysis and Level Valuesmentioning

confidence: 99%

Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V)

Reader

2016

Atoms

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“…The attempts to apply such statistical approach for determination of the energy level values appeared almost simultaneously in atomic (e. g. the spectra of the Er I, Er II [37], Cl II [38] by the inversion method, and the spectra of the Si I [39], Cl I [40] by the iterative method) and in molecular [14,41] spectroscopy when first digital computers became available. It is interesting to note, that in spite of obvious disadvantages of the iterative method (the problems of convergence and lack of the covariance matrix (see p.6 in [42]), its usage can be met in current publications (see e.g.…”

Section: Introductionmentioning

confidence: 99%

Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Lavrov

Umrikhin

2008

J. Phys. B: At. Mol. Opt. Phys.

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“…We used the ELCALC (Radziemski & Kaufman 1969;Radziemski et al 1970) program to adjust experimental level values to the observed transition line values. The Cowan (1981) computer programs were used for both the initial calculation and the least-squares fit of energy parameters.…”

Section: Calculationsmentioning

confidence: 99%

Wavelengths, Energy Levels, Lifetimes, and Weighted Oscillator Strengths for the S Viii Spectrum

Pagan

Cavalcanti

Jupén

et al. 2011

ApJS

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The weighted oscillator strengths (gf) and lifetimes for S viii presented in this work were obtained by a multiconfigurational Hartree-Fock relativistic approach. In this calculation, the electrostatic energy parameters were optimized by a least-squares procedure in order to improve the adjustment to experimental energy levels. The values for gf and lifetimes were then calculated on the basis of these adjusted parameters. New classifications are proposed for energy levels belonging to the 4s and 4d configurations and lines related to them.

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Wavelengths, Energy Levels, and Analysis of Neutral Atomic Chlorine (Cl i)

Cited by 207 publications

References 13 publications

Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V)

Spectrum and Energy Levels of Four-Times Ionized Yttrium (Y V)

Optimal values of rovibronic energy levels for triplet electronic states of molecular deuterium

Wavelengths, Energy Levels, Lifetimes, and Weighted Oscillator Strengths for the S Viii Spectrum

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