Spectrum of La IX : an interesting example of configuration interaction

Gayasov, Robert R.; Joshi, Y N

doi:10.1364/josab.15.002614

Cited by 13 publications

(22 citation statements)

References 6 publications

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“…In the last few years our laboratory has been engaged in investigating lanthanum spectra belonging to di¡erent ionization stages, viz. La VI [2], La VII [3], La VIII [4] and La IX [5]. During these investigations we observed that some of the lines attributed to La X [1] in fact belonged to di¡erent ionization stages of lanthanum spectra.…”

Section: Introduction and Experimentalmentioning

confidence: 73%

See 1 more Smart Citation

Revised and Extended Analysis of Nine-Times-Ionized Lanthanum (La X)

Gayasov¹,

Joshi²,

Ryabtsev³

1999

Phys. Scr.

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The lanthanum spectrum was photographed in the 80-1240 Ð region on a variety of vacuum spectrographs using triggered spark sources. The analysis of nine-times ionized lanthanum (La X) has led to revision of four previously identi¢ed levels of the 5s5d con¢guration and established one new level 1 S 0 of the 5s6s con¢guration, four levels of the 5s4f con¢guration, and nine out of twelve levels of the 5p4f con¢guration. The least squares ¢tted parametric (LSF) and Hartree-Fock (HF) calculations interpret the observed spectrum adequately. Fifty eight lines are now classi¢ed in La X, out of which forty ¢ve are new lines.

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Section: Introduction and Experimentalmentioning

confidence: 73%

“…As we had the wavelength data available in the appropriate region, the study of La X was undertaken. The additional reason for investigating this spectrum was to locate the low-lying con¢gurations involving f-electrons, which have been successfully identi¢ed in other lanthanum spectra [4,5].…”

Section: Introduction and Experimentalmentioning

confidence: 99%

Revised and Extended Analysis of Nine-Times-Ionized Lanthanum (La X)

Gayasov¹,

Joshi²,

Ryabtsev³

1999

Phys. Scr.

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“…Levels 5s 2 4f were identified by Larsson et al (1996) and by Wang et al (1996) based on nine lines measured with an uncertainty in the interval 0.5-1.0 Å and we confirmed all their identifications. Experimental levels of the 5s4f 5p configuration appeared in the analysis of Cs vii (Gayasov & Joshi 1999), Ba viii , La ix (Gayasov & Joshi 1998;, and Ce x (Joshi et al 2001), but they have not been observed in Xe vi and other members of the isoelectronic sequence. This seems to be an important configuration for the future extension of the Xe vi analysis, since its levels are in the interval 258-328 10 3 cm −1 (273-343.5 10 3 cm −1 according to Biémont et al 2005), between the 5s 2 6s and 5s 2 6d configurations.…”

Section: Configurations 5s 24 F and 5s4f 5pmentioning

confidence: 99%

“…To support our analysis, we used data from the In I-like isoelectronic sequence for Sb iii to La ix that were extensively investigated at Dr. Joshi's laboratory at Saint Francis Xavier University, Antigonish, Canada (Tauheed et al 1998;Gayasov & Joshi 1998Tauheed et al 1999Tauheed et al , 2000.…”

Section: Introductionmentioning

confidence: 99%

REVISED AND EXTENDED ANALYSIS OF FIVE TIMES IONIZED XENON, Xe VI

Gallardo

Raineri

Almandos

et al. 2014

ApJS

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A capillary discharge tube was used to record the Xe spectrum in the 400-5500 Å region. A set of 243 lines of the Xe vi spectrum was observed, and 146 of them were classified for the first time. For all known lines, we calculated the weighted oscillator strengths (gf) and weighted transition probabilities (gA) using the configuration interaction in a relativistic Hartree-Fock approach. The energy matrix was calculated using energy parameters adjusted to fit the experimental energy levels. Core polarization effects were taken into account in our calculations. Experimental energy values and calculated lifetimes are also presented for a set of 88 levels. From these levels, 32 were classified for the first time and 33 had their values revised. Our analysis of the 5s5p5d and 5s5p6s configurations was extended in order to clarify discrepancies among previous works.

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“…The valence and in some cases sub valence emission spectra of lanthanum up to ten times ionized are well known. Conventional spark sources were used to produce valence 5p spectra of La VI to La X in the 80-1240 Å wavelength region on a variety of spectrographs (Gayasov et al 1997, 1998Gayasov and Joshi 1998a,1998b. The spectrum of Xe I-like La IV has been observed using a spark discharge by Reader and Epstein (1975), who identified resonance transitions to the 5p 6 1 S 0 ground state from levels with J = 1 of the 5p 5 5d and 5p 5 6s configurations.…”

Section: Introductionmentioning

confidence: 99%

4d → 5p transitions in the EUV photoabsorption spectrum of La V, La VI and La VII

Murphy

Niga²,

Cummings³

et al. 2006

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

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The photoabsorption spectra of La V, La VI and La VII have been recorded in the 85–96 eV region using the dual laser plasma technique. 4d → 5p transitions from their ground configurations were observed and identified with the aid of Hartree–Fock with configuration interaction calculations. The excited states were found to decay by autoionization involving 5s or 5p electrons and rates for the different processes and resulting linewidths were calculated and compared with experiment.

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Spectrum of La IX : an interesting example of configuration interaction

Cited by 13 publications

References 6 publications

Revised and Extended Analysis of Nine-Times-Ionized Lanthanum (La X)

Revised and Extended Analysis of Nine-Times-Ionized Lanthanum (La X)

REVISED AND EXTENDED ANALYSIS OF FIVE TIMES IONIZED XENON, Xe VI

4d → 5p transitions in the EUV photoabsorption spectrum of La V, La VI and La VII

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