Revised and Extended Analysis of the Ag II Spectrum and Term System

Kalus, Gabriele; Litzén, Ulf; Launay, Françoise; Tchang-Brillet, Wan-Ü Lydia

doi:10.1238/physica.regular.065a00046

Cited by 20 publications

(44 citation statements)

References 20 publications

(45 reference statements)

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“…The calculated eigenvalues of the Hamiltonian were optimized to the observed energy levels via a least‐squares fitting procedure using the available experimental energy levels. In fact, all the levels taken from the NBS compilation (NIST 2005b), including refined values due to Benschop et al (1975) and to Kalus et al (2002), were included in the fitting procedure. The scaling factors of the F k , G k and R k integrals (not optimized in the least‐squares fitting procedure) were chosen equal to 0.80, while the spin–orbit integrals were left at their ab initio values.…”

Section: Hfr Calculationsmentioning

confidence: 99%

Radiative parameters for some transitions in the spectrum of Ag ii

Campos

Ortiz

Mayo

et al. 2005

Monthly Notices of the Royal Astronomical Society

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Radiative parameters for transitions depopulating the levels belonging to the 4d85s2, 4d96s and 4d95d configurations of Ag ii have been obtained from a combination of theoretical lifetimes and experimental branching fractions. On the experimental side, a laser‐produced plasma was used as a source of Ag+ ions. The light emitted by the plasma was analysed by a grating monochromator coupled with a time‐resolved optical multichannel analyser system. Spectral response calibration of the experimental system was performed using a deuterium lamp in the wavelength range from 200 to 400 nm, and a standard tungsten lamp in the range from 350 to 600 nm. The transition probabilities were obtained from measured branching ratios and theoretical radiative lifetimes of the corresponding states calculated with a relativistic Hartree–Fock approach including core‐polarization effects and configuration interaction in an extensive way. Theoretical and experimental data have been compared and the new data have also been compared with the few previous results available in the literature.

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Section: Hfr Calculationsmentioning

confidence: 99%

Radiative parameters for some transitions in the spectrum of Ag ii

Campos

Ortiz

Mayo

et al. 2005

Monthly Notices of the Royal Astronomical Society

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“…The most complete previous analysis of the Ag II spectrum was made by Kalus et al [ 1 ]. These authors measured the spectrum emitted by a pulsed hollow-cathode discharge in the region 940 Å to 8500 Å.…”

Section: Introductionmentioning

confidence: 99%

“…Kalus et al [ 1 ] noted that their line list does not include many of the lines reported by earlier observers. In particular, they mentioned that Gilbert [ 2 ] was able to observe many more combinations between highly excited levels by using a condensed hollow-cathode discharge.…”

Section: Introductionmentioning

confidence: 99%

A Critical Compilation of Energy Levels, Spectral Lines, and Transition Probabilities of Singly Ionized Silver, Ag II

Kramida

2013

J. RES. NATL. INST. STAN.

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All available experimental measurements of the spectrum of the Ag+ ion are critically reviewed. Systematic shifts are removed from the measured wavelengths. The compiled list of critically evaluated wavelengths is used to derive a comprehensive list of energy levels with well-defined uncertainties. Eigenvector compositions and level designations are found in two alternate coupling schemes. Some of the older work is found to be incorrect. A revised value of the ionization energy, 173283(7) cm−1, equivalent to 21.4844(8) eV, is derived from the new energy levels. A set of critically evaluated transition probabilities is given.

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“…The atomic energy level structure of Nb ii was extended by Ryabtsev et al (2000) as part of a project at Lund which aim at improving the atomic data for the singly ionized 4d-transition group. Within this project the term analyses of Y ii (Nilsson et al 1991), Mo ii (Nilsson & Pickering 2003), Ru ii (Karlsson et al 2002), Pd ii (Litzén et al 2001) and Ag ii (Kalus et al 2002) have been published, and analyses of Zr ii and Rh ii are in progress. Oscillator strengths have been measured in Zr ii (Sikström et al 1999;Ljung et al 2006), Mo ii (Sikström et al 2001), Ru ii (Johansson et al 1994) and Pd ii (Lundberg et al 1996).…”

Section: Introductionmentioning

confidence: 99%

Experimental oscillator strengths and hyperfine constants in Nb ii

Nilsson¹,

Ivarsson²

2008

A&A

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We used high-resolution Fourier transform spectroscopy to measure new and improved transition probabilities and hyperfine data for singly ionized niobium. Intensity calibrated spectra were used to measure branching fractions of 145 Nb ii lines in the wavelength interval 2600-4600 Å. Combining the branching fractions with previously reported lifetimes, absolute oscillator strengths for these 145 transitions were derived. In addition, line structures due to magnetic hyperfine interaction were studied resulting in new hyperfine splitting constants for 28 even and 24 odd energy levels.

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Revised and Extended Analysis of the Ag II Spectrum and Term System

Cited by 20 publications

References 20 publications

Radiative parameters for some transitions in the spectrum of Ag ii

Radiative parameters for some transitions in the spectrum of Ag ii

A Critical Compilation of Energy Levels, Spectral Lines, and Transition Probabilities of Singly Ionized Silver, Ag II

Experimental oscillator strengths and hyperfine constants in Nb ii

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