Isoelectronic behavior of resonant and intercombination lines in MgI-like ions

Fournier, K. B.; Goldstein, W. H.; Finkenthal, M.; Bell, R. E.; Terry, J. L.

doi:10.1016/0368-2048(96)02976-3

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…Also shown in the table are the number of energy levels that arise from each configuration and the amount of power emitted by transitions originating from each configuration. Nearly 10% of the power emitted by this ion is via electric quadrupole (E2) 3p63dg -+ 3p63d84s decays, which originate in highly populated 3p63d84s levels [30].…”

Section: Collisional-radiative Modelsmentioning

confidence: 99%

“…it is found that only 35% of the ion's population is in the true ground level. Thus, strong line features can be fed by levels other than the The emissivities of the charge states Mo3'+ [30], Mol5+ [31] and Mol4+ [32] have been studied on Alcator C-Mod; it is found that direct impact ionization (and three body recombination) does not affect the level populations for highly stripped molybdenum ions. Collisional-radiative models which account for ionization, including EA, DR and RR, have been validated spectroscopically for Mo2'+ to Mo33f on the FTU [33]; again, strong line features for highly stripped molybdenum ions are found to be fed almost exclusively by impact excitations.…”

Section: Collisional-radiative Modelsmentioning

confidence: 99%

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Calculation of the radiative cooling coefficient for molybdenum in a low density plasma

et al. 1997

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The radiative cooling coefficient for molybdenum (Z=42) in a low density (ne ≲ 1015 cm-3) plasma is calculated. First, the molybdenum charge state distribution (CSD) is computed using the best available atomic physics data for ground state recombination and ionization, including the rates of excitation-autoionization for Mo6+ to Mo13+ and Mo23+ to Mo32+. The emissivities of Mo4+ to Mo41+ are then found using a collisional-radiative model such that the contributions from metastable levels to an ion's emissivity are taken into account. The CSD and the radiative emissivity for all molybdenum ions are combined to yield the total radiative cooling coefficient for molybdenum in a low density plasma. A radiative loss coefficient over 2 orders of magnitude smaller than that predicted by an `average ion' model for temperatures relevant to tokamak divertor and scrape-off layer plasmas (Te ≲ 50 eV) is found. The cooling coefficient of the present work varies from a factor of 2 smaller to a factor of 2 larger than that predicted by the `average ion' model for all other plasma temperatures. The coefficient calculated in the present work is benchmarked against the measured bolometric loss profile from a molybdenum dominated shot in the Frascati Tokamak Upgrade (FTU)

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Section: Collisional-radiative Modelsmentioning

confidence: 99%

Section: Collisional-radiative Modelsmentioning

confidence: 99%

Calculation of the radiative cooling coefficient for molybdenum in a low density plasma

et al. 1997

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“…Several diagnostic line ratios for the solar transition region have been determined using transitions in Si III, S V, and Fe XV, among others. For example, the observed intensity ratio of some 3s 2 1 S 0 -3snp 1 P 1 to 3s 2 1 S 0 -3snp 3 P 1 transitions in several Mg-like ions has presented those who model plasma spectra with a challenge: the observed intensity of spinforbidden lines is always several times greater than what simple models predict (Fournier et al 1996). This feature has been reproduced in the present CIV3 oscillator strengths of S V and Fe XV, after performing a wavefunction optimization in which 3snp states of 1 P 1 symmetry were mixed with those of 3 P 1 symmetry.…”

Section: Introductionmentioning

confidence: 99%

CIV3 and relativistic quantum defect orbital (RQDO) oscillator strengths in Mg-like ions of astrophysical interest

Almaraz

Hibbert

Lavín

et al. 2000

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

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Astrophysically relevant transitions in the Mg-like ions Si III, S V and Fe XV have been studied. A J -dependent CIV3 calculation, more extensive than other, earlier ones, has led to improved accuracy in the calculated energy levels and oscillator strengths. Independent relativistic quantum defect orbital and multiconfigurational Dirac-Fock calculations have also been performed. An analysis of the results is given.

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“…Eleven coupled rate equations per ion belonging to the singlet configurations: 3s 2 , 3s3p, 3s3d, 3s4s, 3s4p, 3s4d, 3s4f 3s5s, 3s5p, 3s5d and 3s5f have been solved simultaneously (triplet-singlet transitions are ignored due to their slow nature [4]). The level populations were calculated as a function of the electron density and electron temperature.…”

Section: Introductionmentioning

confidence: 99%