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

Reader, Joseph

doi:10.3390/atoms4040031

Cited by 5 publications

(2 citation statements)

References 20 publications

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“…between 4s 2 4p 4 4d and 4s4p 6 configurations which was varied as shown in Table IV. The scaling factors for the 4s 2 4p 4 4d configuration are in agreement with the isoelectronic trends for the sequence Y 4+ [54], Zr 5+ [55], Nb 6+ [56], and Mo 7+ [48], once these previous spectra are fitted with the same set of interacting configurations as used for Sn 15+ . Several key Cowan scaling factors are presented along the Br-like isoelectronic sequence in Fig.…”

Section: Spectrum Of Sn 15+supporting

confidence: 76%

EUV spectroscopy of highly chargedSn13+−Sn15+ions in an electron-beam ion trap

et al. 2020

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Extreme-ultraviolet (EUV) spectra of Sn 13+ −Sn 15+ ions have been measured in an electron-beam ion trap (EBIT). A matrix inversion method is employed to unravel convoluted spectra from a mixture of charge states typically present in an EBIT. The method is benchmarked against the spectral features of resonance transitions in Sn 13+ and Sn 14+ ions. Three new EUV lines in Sn 14+ confirm its previously established level structure. This ion is relevant for EUV nanolithography plasma but no detailed experimental data currently exist. We used the Cowan code for first line identifications and assignments in Sn 15+. The collisional-radiative modeling capabilities of the Flexible Atomic Code were used to include line intensities in the identification process. Using the 20 lines identified, we have established 17 level energies of the 4p 4 4d configuration as well as the fine-structure splitting of the 4p 5 ground-state configuration. Moreover, we provide state-of-the-art ab initio level structure calculations of Sn 15+ using the configuration-interaction many-body perturbation code AMBiT. We find that the here-dominant emission features from the Sn 15+ ion lie in the narrow 2% bandwidth around 13.5 nm that is relevant for plasma light sources for state-of-the-art nanolithography.

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Section: Spectrum Of Sn 15+supporting

confidence: 76%

EUV spectroscopy of highly chargedSn13+−Sn15+ions in an electron-beam ion trap

et al. 2020

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“…Separation of Y VII from Y VI was difficult for many lines. Details of the wavelength calibration are given in a recent paper on Y V [18].…”

Section: Methodsmentioning

confidence: 99%

Spectrum and energy levels of six-times ionized yttrium (Y VII)

Reader¹

2018

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

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The spectrum of six-times ionized yttrium, Y VII, was photographed with a sliding-spark discharge on 10.7 m normal-and grazing-incidence spectrographs. The region of observation was 157-824 Å. The observations extend the known configurations 4s 2 4p 3 , 4s4p 4 , 4p 5 , 4s 2 4p 2 5s, 4s 2 4p 2 6s to the nearly complete 4s 2 4p 2 4d configuration. Our results for 4s 2 4p 2 4d significantly revise results of Rahimullah et al (1978 Phys. Scr. 18 96); Ateqad et al (1984 J. Phys. B: At. Mol. Phys. 17 4617). A total of 168 lines and 56 energy levels are now known for this ion. The observed configurations were interpreted with Hartree-Fock calculations and least-squares fits of the energy parameters to the observed levels. Transition probabilities for all classified lines were calculated with the fitted parameters.

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