Transitions and the effects of configuration interaction in the spectra of Sn XV–Sn XVIII

D’Arcy, Rebekah; Ohashi, Hayato; Suda, Seiichi; Tanuma, H.; Fujioka, Shinsuke; Nishimura, Hiroaki; Nishihara, Katsunobu; Suzuki, C.; Katō, Takako; Koike, Fumihiro; White, J.; O’Sullivan, Gerry

doi:10.1103/physreva.79.042509

Cited by 46 publications

(57 citation statements)

References 22 publications

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“…Though an observation of the 4f 14 5s 2 S 1/2 -4f 14 5p 2 P 1/2 lines have been reported in an electron beam ion trap [25], such lines are unlikely to appear in low density fusion type plasmas which tend to be dominated by resonance transitions to the ground configuration [26,27]. The lowest odd parity excited configuration, 4f 12 5s 2 5p, begins at 10 eV away but as its centre of gravity (E av ) is 21.35 away, we chose to ignore it as it will have limited CI effects on the lower configuration and we calculated the 5s-5p transitions involving the 4f figure 4.…”

Section: S-5p Transitions For Open 5s/4f Subshell Ions (Wmentioning

confidence: 94%

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Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Suzuki¹,

Harte²,

Kilbane³

et al. 2011

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

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The UCD community has made this article openly available. Please share how this access benefits you. Your story matters! (@ucd_oa) Some rights reserved. For more information, please see the item record link above. TitleInterpretation of spectral emission around 20 nm region from tungsten ions observed in fusion device plasmas Abstract. We have measured extreme ultraviolet (EUV) spectra from tungsten ions around 20 nm region in plasmas produced in the Large Helical Device at the National Institute for Fusion Science. The spectra after injecting a tungsten pellet into a hydrogen plasma were monitored by a grazing incidence spectrometer. Quasicontinuum spectral feature arising from unresolved transition array (UTA) was observed around 20 nm region in plasmas with temperatures below 1.0 keV. This structure is reasonably considered to be the same one as those observed in another tokamak device or laser produced plasmas under low temperature conditions. Atomic structure calculations have been performed for tungsten ions with open 5p, 5s and 4f subshells (W 7+ -W 27+ ) to interpret this commonly observed feature around 20 nm. Wavelengths and gA values for these transitions were calculated, and their mean wavelengths and extent were compared with the observations, which suggests that the emission largely arises from n = 5-5 transitions in stages lower than W 27+ .

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Section: S-5p Transitions For Open 5s/4f Subshell Ions (Wmentioning

confidence: 94%

“…In earlier experiments on Sn and Xe injection in the LHD, it was noted that for the majority of ion stages, only resonance transitions to the ground configuration were observed but a notable exception in each case was provided by Cu-like Sn and Xe ions [22,27,28]. Cu-like ions have a single 4s electron outside a closed n = 3 shell.…”

Section: +mentioning

confidence: 99%

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Suzuki¹,

Harte²,

Kilbane³

et al. 2011

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

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show abstract

“…The EUV spectra were recorded by a grazing incidence spectrometer SOXMOS [39] whose groove density and focal length were 600 mm collapse [24,41,42]. The spectrometer was carefully calibrated by observing carbon, boron and neon lines whose wavelengths are well known following neon injection (carbon and boron lines are always present as impurities in the LHD).…”

Section: Figure 1: Time Sequences Of Neutral Beam Injection (Nbi Heamentioning

confidence: 99%

Tungsten spectra recorded at the LHD and comparison with calculations

Harte¹,

Suzuki²,

Katō³

et al. 2010

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

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“…In the lower ion stages, Xe 16+ and Xe 17+ , which have open 4d subshells, the strongest features in the corresponding Xe XVII and Xe XVIII spectra are expected to result from resonance transitions, 4s 2 4p 5 4d n+1 + 4s 2 4p 6 4d n−1 4f → 4s 2 4p 6 4d n (n = 2, 1), with the possibility of transitions between excited states also making a contribution. In a recent study of the emission from Sn ions in stages from Sn 14+ to Sn 17+ , that is, with ground configurations 4p 6 to 4p 3 , resonance transitions of the type 4p m−1 4d → 4p m were indeed present, but the dominant contribution came from transitions of the type 4s 2 4p m−1 4f + 4s 2 4p m−2 4d 2 + 4s4p m 4d → 4s 2 4p m−1 4d [16]. In the present case, with increasing ion stage and the emergence of the open 4p subshell it is of interest to see if the same situation obtains for Xe as in Sn and explore if the contribution from excited to excited state transitions dominates these spectra also.…”

Section: Resultsmentioning

confidence: 98%

EUV spectra of Xe xvii–Xe xxi produced in charge-exchange collisions

D’Arcy

Morris

et al. 2012

Phys. Rev. A

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Charge-state-specific spectra produced from charge exchange collisions between xenon ions and helium target atoms using an ECR (electron cyclotron resonance) source have been recorded in extreme ultraviolet (EUV). At low target gas pressures, the spectra were produced after a single collision event involving electron capture by the projectile ion and in each case intense emission near 11 nm was observed. The spectra of Xe 16+ to Xe 20+ are compared with atomic structure calculations and the possible mechanisms for electron capture are discussed. There is some evidence that for lower charged ions the spectra in the 10-15 nm region result mainly from transfer excitation or ionization processes rather than direct single electron capture into high nl states.

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Transitions and the effects of configuration interaction in the spectra of Sn XV–Sn XVIII

Cited by 46 publications

References 22 publications

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Interpretation of spectral emission in the 20 nm region from tungsten ions observed in fusion device plasmas

Tungsten spectra recorded at the LHD and comparison with calculations

EUV spectra of Xe xvii–Xe xxi produced in charge-exchange collisions

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