New atomic data for Ti X

Singh, Jagjit; Jha, Alok; Verma, Nupur; Mohan, Man

doi:10.1016/j.adt.2010.06.002

Cited by 5 publications

(36 citation statements)

References 26 publications

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“…Theoretical energies obtained by Singh et al [23] are in close agreement with those of NIST, because of the adjustments made. The MCHF energies [21] are also in close agreement with the NIST compilations, but their energy for 3s 2 3p 2 P o 3/2 (level 2) is lower by ∼ 3%.…”

Section: Lowest 40 Levelssupporting

confidence: 68%

“…For example, they identified only half of the 3p 2 3d levels, as may be seen in Table 4 of [23] or the current Table 2a. The latest calculations in the literature are by Singh et al [23], who not only included extensive CI (configuration interaction), but also reported energies and radiative rates for transitions among 303 levels, which belong to the (1s 2 2s 2 2p 6 ) 3s 2 3p, 3s3p 2 , 3s 2 3d, 3p 3 , 3s3p3d, 3p 2 3d, 3s3d 2 , 3p3d 2 , 3d 3 , 3s 2 4ℓ, 3p 2 4ℓ, 3s3p4ℓ, 3s 2 5ℓ, and 3s 2 6ℓ configurations. We discuss these below.Singh et al [23] adopted the CIV3 code of Hibbert [24] and included one-body relativistic operators in their calculations, which should be sufficient for a moderately heavy ion such as Ti X.…”

mentioning

confidence: 96%

“…Further measurements were made by Smitt et al [15] and Churilov and Levashov [16]. The experimental data have been compiled by Corliss and Sugar [17] and are also available at the NIST (National Institute of Standards and Technology) website http://www.nist.gov/pml/data/asd.cfm.Considering the importance of Ti ions, several calculations have been performed for Ti X -see for example [18] - [23]. A variety of sophisticated methods and codes have been adopted by these workers, but the calculations of [18], [19], [21] and [22] have been confined to the lowest 40 levels of Ti X belonging to the 3s 2 3p, 3s3p 2 , 3s 2 3d, 3p 3 and 3s3p3d configurations.…”

mentioning

confidence: 99%

“…However, there are some problems with their results. Firstly, the process of fine-tuning is only helpful if experimental data are available for a majority of levels, which is not the case with Ti X as may be noted from Table 4 of [23]. For the same reason it does not correct the level orderings.…”

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confidence: 99%

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Energy levels and radiative rates for transitions in Ti X

Aggarwal¹,

Keenan²

2013

Phys. Scr.

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We report calculations of energy levels, radiative rates, oscillator strengths and line strengths for transitions among the lowest 345 levels of Ti X. These include 146 levels of the n ≤ 3 configurations and 86 of 3s 2 4ℓ, 3s 2 5ℓ and 3s3p4ℓ, plus some of the 3s 2 6ℓ, 3p 2 4ℓ and 3s3p5ℓ levels. The general-purpose relativistic atomic structure package (grasp) and flexible atomic code (fac) are adopted for the calculations. Radiative rates, oscillator strengths and line strengths are provided for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions among the 345 levels, although calculations have been performed for a much larger number of levels. Comparisons are made with existing results and the accuracy of the data is assessed. Additionally, lifetimes for all 345 levels are listed. Extensive comparisons of lifetimes are made for the lowest 40 levels, for which discrepancies with recent theoretical work are up to 30%. Discrepancies in lifetimes are even larger, up to a factor of four, for higher excited levels. Furthermore, the effect of large CI is found to be insignificant for both the energies and lifetimes for the lowest 40 levels of Ti X which belong to the 3s 2 3p, 3s3p 2 , 3s 2 3d, 3p 3 and 3s3p3d configurations. However, the contribution of CI is more appreciable for the energy levels and radiative rates among higher excited levels. Our listed energy levels are estimated to be accurate to better than 1% (within 0.1 Ryd), whereas results for other parameters are probably accurate to better than 20%.Iron group elements (Sc -Zn) are becoming increasingly important in the study of astrophysical plasmas, as many of their lines are frequently observed from different ionisation stages. These lines provide a wealth of data about the plasma characteristics, including temperature, density and chemical composition. More importantly, iron group elements are often impurities in fusion reactors, and to estimate the power loss from the impurities, atomic data (including energy levels and oscillator strengths or radiative decay rates) are required for many ions. The need for atomic data has become even greater with the developing ITER project. Since there is a paucity of measured parameters, one must depend on theoretical results. Therefore, recently we have reported atomic parameters for many ions of the iron group elements -see for example [1]-[4] and references therein. Among Ti ions, results have already been provided for Ti XXII [5], Ti XXI [6], Ti XX [7], Ti XIX [8] and Ti VI [9], and here we focus our attention on Al-like Ti X.Several emission lines of Ti ions have been observed in astrophysical plasmas, as listed in the CHIANTI database at http://www.chiantidatabase.org. For Ti X, Edlen [10] was the first to classify two lines followed by [11] and [12], who identified several mutiplets among the low-lying terms. However, we are not aware of any astrophysical observations for Ti X, although many emission lines are listed in the 70-35,700Å wavelength rang...

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Section: Lowest 40 Levelssupporting

confidence: 68%

mentioning

confidence: 96%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Energy levels and radiative rates for transitions in Ti X

Aggarwal¹,

Keenan²

2013

Phys. Scr.

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“…In this calculation, we have used an extensive set of CI wavefunctions and included valence-correlation effects in the excitation up to the 5f orbital. Our calculated excitation energies are in excellent agreement with the values from the NIST Atomic Spectra Database.Our new predicted levels, for which no experimental or theoretical data is available, can guide experimentalists in identifying strongly mixed fine-structure levels [16]. Finally, we believe that the present results are the most extensive and definitive to date and should be useful in astrophysical applications and technical plasma modeling.…”

Section: Discussionmentioning

confidence: 58%

New atomic data for Ge XX

Younis

Hibbert

2015

Journal of Quantitative Spectroscopy and Radiative Transfer

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Atomic Data: Division Xii / Commission 14 / Working Group Atomic Data

Nave¹,

Wahlgren²,

Fuhr³

2011

Proc. IAU

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This report summarizes laboratory measurements of atomic wavelengths, energy levels, hyperfine and isotope structure, energy level lifetimes, and oscillator strengths. Theoretical calculations of lifetimes and oscillator strengths are also included. The bibliography is limited to species of astrophysical interest. Compilations of atomic data and internet databases are also included. Papers are listed in the bibliography in alphabetical order, with a reference number in the text.

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New atomic data for Ti X

Cited by 5 publications

References 26 publications

Energy levels and radiative rates for transitions in Ti X

Energy levels and radiative rates for transitions in Ti X

New atomic data for Ge XX

Atomic Data: Division Xii / Commission 14 / Working Group Atomic Data

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