Lifetime measurements and transition probability calculations in singly ionized tungsten (WII)

Nilsson, Hampus; Engström, Lars; Lundberg, Hans; Palmeri, P.; Fivet, V.; Quinet, Pascal; Biémont, Émile

doi:10.1140/epjd/e2008-00131-2

Cited by 24 publications

(40 citation statements)

References 22 publications

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“…At the end of the fitting process, the average deviations between experimental and computed energy levels were found to be equal to 118 cm À 1 (even parity) and 140 cm À 1 (odd parity). These calculations can be seen as an extension of our previous similar works on singly ionized 5d-transition atoms Ta II [16], W II [17], Re II [18], Os II [19], Ir II [20], Pt II [21], and Au II [22].…”

Section: Pseudo-relativistic Hartree-fock Methods With Corepolarizatiosupporting

confidence: 55%

“…Finally our investigation of singly ionized hafnium was extended by comparing our calculated oscillator strengths with available experimental data and by predicting new values for a rather large number of transitions. We hope that this work, in the image of our previous studies [16][17][18][19][20][21][22][23][24], will constitute a good stimulus and a useful guide for experimenters to perform further spectroscopic measurements in this ion.…”

Section: Resultsmentioning

confidence: 86%

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Semi-empirical studies of atomic transition probabilities, oscillator strengths and radiative lifetimes in Hf II

Bouazza

Quinet

Palmeri

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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a b s t r a c tOver the past few years, laser induced fluorescence and Fourier Transform techniques have been applied to measure radiative lifetimes and branching fractions in Hf II in order to derive oscillator strengths and transition probabilities. In the present work, we propose to compare for the first time these experimental data to computed values obtained by two different semi-empirical approaches, respectively based on a parametrization of the oscillator strengths and on a pseudo-relativistic Hartree-Fock model including corepolarization effects. The overall agreement between all sets of data is found to be good. We furthermore give radial integrals of the main atomic transitions in this study: 〈5d6s6p| r 1 |5d 2 6s〉¼ 0.1504 (0.0064), 〈6s 2 6p|r 1 |5d6s 2 〉¼ 1.299 (0.012), 〈5d 2 6p|r 1 |5d 2 6s〉¼ À0.298 (0.013), 〈5d 2 6p|r 1 |5d 3 〉¼ 2.025 (0.027). Finally a new set of oscillator strengths and transition probabilities is reported for many transitions in Hf II.

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Section: Pseudo-relativistic Hartree-fock Methods With Corepolarizatiosupporting

confidence: 55%

Section: Resultsmentioning

confidence: 86%

Semi-empirical studies of atomic transition probabilities, oscillator strengths and radiative lifetimes in Hf II

Bouazza

Quinet

Palmeri

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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“…Odd-parity levels are denoted by ' o ', values of J are given in subscripts. b Lines marked with * are blended and the theoretical value from [17] is given.…”

Section: Transition Probabilitiesmentioning

confidence: 99%

“…From each upper level, there is generally a number of transitions that are too weak to be measured. The total transition probability of these lines has instead been estimated from the theoretical results in Nilsson et al [17]. Thus, it is assumed that even though the theoretical BFs for individual lines might differ from the experimental ones, the sum of all the missing lines should be approximately the same.…”

Section: Transition Probabilitiesmentioning

confidence: 99%

“…Thus, it is assumed that even though the theoretical BFs for individual lines might differ from the experimental ones, the sum of all the missing lines should be approximately the same. In a few cases where the line intensities could not be measured because of blending with lines from other transitions, the theoretical results in Nilsson et al [17] have also been used. The uncertainty of these lines and the missing lines is set to 50%.…”

Section: Transition Probabilitiesmentioning

confidence: 99%

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Branching fractions in singly ionized tungsten

Lennartsson

Nilsson

Blackwell-Whitehead

et al. 2011

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

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The intensity-calibrated spectra of W II have been recorded in the spectral interval 23 000-51 300 cm −1 (1950-4350Å), using the FT500 UV Fourier Transform Spectrometer at Lund Observatory. Combining the intensity data in this work with lifetimes previously measured using the time-resolved laser-induced-fluorescence (TR-LIF) technique resulted in transition probabilities and log gf values for 95 transitions in W II, originating from nine different upper levels with energies between 47 179 and 55 392 cm −1 . Of these transitions, 85 have never been measured before. The new data are compared with theoretical calculations and with previously measured values when available.

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Recent Investigations of Radiative Lifetimes and Transition Probabilities in Heavy Elements (37≤Z≤92)

Biémont

2013

Springer Series on Atomic, Optical, and Plasma Physics

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Lifetime measurements and transition probability calculations in singly ionized tungsten (WII)

Cited by 24 publications

References 22 publications

Semi-empirical studies of atomic transition probabilities, oscillator strengths and radiative lifetimes in Hf II

Semi-empirical studies of atomic transition probabilities, oscillator strengths and radiative lifetimes in Hf II

Branching fractions in singly ionized tungsten

Recent Investigations of Radiative Lifetimes and Transition Probabilities in Heavy Elements (37≤Z≤92)

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