Resonance lines and energy levels of Cs iii, Ba iv, and La v

Epstein, Gerald L.; Reader, Joseph

doi:10.1364/josa.66.000590

Cited by 32 publications

(38 citation statements)

References 10 publications

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“…For Cs 2+ the absorption profiles are further complicated by the fact that the ground configuration contains two terms and in a laser-produced plasma, absorption from all low-lying states which can be thermally populated is obtained. In the present case the 2 P 3/2 − 2 P 1/2 interval is 1.717 eV (Epstein and Reader 1976) and the cross-sections for absorption from each of these levels was evaluated separately (figure 3) and summed with a weighting appropriate to a particular excitation temperature. This procedure has already been shown to yield good agreement between theory and experiment for 4d → 5p transitions in ionized Sb and Te (D'Arcy et al 1999, Murphy et al 1999).…”

Section: Resultsmentioning

confidence: 99%

Discrete structure in the 4d photoabsorption spectra of CsIII, CsIVand CsV

Cummings

O'Sullivan

2001

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

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XUV photoabsorption spectra of caesium, in ion stages up to Cs 4+ , have been obtained experimentally with the dual laser-produced plasma technique. From the results it can be inferred that the 4d photoabsorption cross-section changes dramatically in appearance along the isonuclear sequence Cs through Cs 4+ . While the spectra of Cs, Cs + and Cs 2+ are dominated by a giant dipole 4d → εf resonance, discrete structure, which essentially increases in intensity with increasing ion stage, is also present below threshold. Between Cs 2+ and Cs 3+ much of the oscillator strength is abruptly transferred from the continuum to the discrete spectrum so that a few intense broad features dominate the spectra of Cs 3+ and Cs 4+ . Multiconfiguration Hartree-Fock calculations successfully account for this behaviour and permit identification of the discrete features.

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Section: Resultsmentioning

confidence: 99%

Discrete structure in the 4d photoabsorption spectra of CsIII, CsIVand CsV

Cummings

O'Sullivan

2001

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

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“…However, beam-foil spectroscopy is known to be mono-isotopic, and therefore in-beam reference lines can come only from La spectra. Epstein and Reader [32,33] present lines and relative intensities based on their observations of sliding spark spectra. Although their strongest lines (La IV 5p 6 1 S 0 -5p 5 nl transitions) were recognized in our spectra and served as anchors of the wavelength scale, the relative line intensities in our beam-foil spectra turned out very different from theirs.…”

Section: Main Characteristics Of the Bfs Experimentsmentioning

confidence: 99%

“…Laboratory observations of the spectra of such rare earth ions have achieved high wavelength resolution and accuracy (e.g., [29][30][31][32][33]). However, with classical light sources such as a sliding spark, the observations have been limited to the recording of time-integrated spectra.…”

Section: Introductionmentioning

confidence: 99%

Atomic structure calculations and beam-foil observations of La IV

et al. 2009

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Relativistic Hartree-Fock and multiconfigurational Dirac-Fock calculations of atomic structure and transition rates have been carried out in trebly ionized lanthanum (La 3+ , Z = 57). The calculations have to cope with configuration interaction effects but also with the very complex situation of the collapse of the 4f wave function. The calculations are compared to experimental data obtained with beam-foil spectroscopy in the extreme ultraviolet, at ion energies that favour the production of the spectrum La IV. Besides lines known from sliding spark discharges, many more lines are observed that have not yet been identified. Time-resolved measurements yield three level lifetimes in La IV that agree roughly with the results of our own calculations.PACS Nos: 32.30.Jc, 32.70.Cs, 34.50.Fa, 31.15.ag, 31.15.xr Résumé : Des calculs Hartree-Fock relativistes de structures atomiques et de taux de transition et des calculs à l'aide de l'approche multiconfigurationnelle de Dirac-Fock ont été effectués dans le lanthane trois fois ionisé (La 3+ , Z = 57). Ces calculs doivent prendre en compte l'interaction de configuration mais aussi la situation très complexe associée à la contraction de l'orbitale 4f. Les calculs ont été comparés aux données expérimentales obtenues à l'aide de la spectroscopie faisceau-lame dans l'ultraviolet lointain à des énergies qui favorisent l'émission du spectre de La IV. Outre les raies spectrales connues à partir des spectres d'étincelles glissantes, beaucoup de raies supplémentaires ont été observées qui n'ont pas encore été identifiées. Les mesures résolues dans le temps ont permis d'obtenir trois durées de vie dans La IV qui sont en accord satisfaisant avec les résultats de nos calculs.[Traduit par la Rédaction]

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“…All the 4 energy levels related to this transition are calculated and given in Table 1, together with the existing experimental results. [27] The main jj coupling components of the ASFs are also given in the table. It can be found that the calculations are in rather good agreement with measurements within just a minor deviation in a fine-structure splitting of about 2%.…”

Section: Radiative Decay Process Of 4d Coreexcited Statesmentioning

confidence: 99%

Theoretical study on decay of the 4d core-excited states of Cs III

2008

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In a recent XUV photoabsorption spectrum of Cs III ions by Cummings and O'Sullivan [2001 J. Phys. B 34 199], rather large linewidths were found for the 4d95s25p6 – 4d105s25p5 transition which are quite in disagreement with corresponding quasi-relativistic multiconfiguration Hartree–Fock (MCHF) calculation. In the present work, a detailed multiconfiguration Dirac-Fock study has been carried out to explore this discrepancy. Owing to the detailed consideration of electron correlation effects, some ‘forbidden’ Auger decay channels, such as 4d105s25p35d and 4d105s05p6, would become ‘open’. As a result, remarkable improvement of the linewidths has been obtained in our calculation. Furthermore, the theoretical Auger spectrum of the 4d95s25p6 core-excited states of Cs III ions is given in the present work.

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Resonance lines and energy levels of Cs iii, Ba iv, and La v

Cited by 32 publications

References 10 publications

Discrete structure in the 4d photoabsorption spectra of CsIII, CsIVand CsV

Discrete structure in the 4d photoabsorption spectra of CsIII, CsIVand CsV

Atomic structure calculations and beam-foil observations of La IV

Theoretical study on decay of the 4d core-excited states of Cs III

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