Relativistic distorted-wave collision strengths and oscillator strengths for f-like ions with 22 ≤ Z ≤ 92

Sampson, Douglas H.; Zhang, Hong Lin; Fontes, Christopher J.

doi:10.1016/0092-640x(91)90023-w

Cited by 62 publications

(103 citation statements)

References 21 publications

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“…These calcula were performed by applying the fully relativistic distorted-wave methods described the previous sections. These results have been published in Data and Nuclear Data Tables and 88 transitions (5) 3 transitions among n = 2 levels and 327 transitions from these levels to n = 3 levels 71 F-like ions with 22 ~ Z ~ 92 [38]; 248 transitions from the ground level to n = 1 and n = 5 levels in 33 We will refer to these publications according to the serial numbers listed above. For example, Paper 1 refers to publication on ions 93) where N is the number of the bound electrons per ion.…”

Section: A Summary Of Completed Fine-sttuctur-e Excitationmentioning

confidence: 99%

“…The notation used in labeling the levels can be found in ref. [38], along with a more complete set of tables. With the inclusion of all these additions to our program, we obtained very good agreement with the Grant code for oscillator strengths for n = 2 to n = 3 transitions in F-like ions with Z = 92, as well as 34.…”

Section: Casementioning

confidence: 99%

“…One way to correct this discrepancy is to replace the energies obtained from our structure code with calculated by the Grant code, as was done in ref. [38] for ions. 'With this approach, it is important to recognize that different numerical procedures, such as our using a linear radial grid versus the logarithmic grid Grant code, different physics, such as our DFS potential vs. the multi-configuration Fock (MCDF) potential in the Grant code, will not only affect energies obtained, but also the resulting mixing coefficients that form the fine-structure wave functions.…”

Section: Improvements Computing Free-electron Wave Junctionsmentioning

confidence: 99%

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A fully relativistic approach for calculating atomic data for highly charged ions

2009

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AbstractvVe present a review of our fully relativistic approach to calculating atomic data charged ions, highlighting a research effort that spans years. Dediscussions of both theoretical and numerical techniques are provided. Our basic approach is expected to provide accurate results for ions that range from approximately half ionized to fully stripped. Options for improving the accuracy and range of validity of this approach are also discussed. In developing numerical methods for calculating data within this framework, considerable emphasis is placed on techniques that are robust efficient. A of fundamental processes are considered including: photoexcitation, electron-impact excitation, electron-impact ionization, autoionization, electron capture, photoionization and photorecombina tion. Resonance contributions to a variety of these processes are also considered, including discussions of autoionization, electron capture and dielectronic recombi nation. Ample numerical examples are provided in order to illustrate the approach and to demonstrate its usefulness in providing data for large-scale plasma modeling.

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Section: A Summary Of Completed Fine-sttuctur-e Excitationmentioning

confidence: 99%

Section: Casementioning

confidence: 99%

Section: Improvements Computing Free-electron Wave Junctionsmentioning

confidence: 99%

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A fully relativistic approach for calculating atomic data for highly charged ions

2009

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“…Since both Ne and Ar are high Ðrst ionization potential (FIP) elements (see°8) their abundances are expected, anywhere in the solar upper atmosphere, to be photospheric. Sampson et al 1991 ;Blackford & Hibbert 1994 ;Cornille et al 1992. Collisional data from Sampson et al 1991.…”

Section: Temperature Diagnosticsmentioning

confidence: 99%

“…Sampson et al 1991 ;Blackford & Hibbert 1994 ;Cornille et al 1992. Collisional data from Sampson et al 1991. Fe XIX : Radiative and collisional data from Lolergue et al 1985 ;Bhatia et al 1989a.…”

Section: Temperature Diagnosticsmentioning

confidence: 99%

Identification of Spectral Lines in the 500–1600 A Wavelength Range of Highly Ionized Ne, Na, Mg, Ar, K, Ca, Ti, Cr, Mn, Fe, Co, and Ni Emitted by Flares (T_e≥ 3 x 10⁶K) and Their Potential Use in Plasma Diagnostics

Feldman

Curdt

Landi

et al. 2000

ApJ

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On 1999 May 9 the Solar Ultraviolet Measurements of Emitted Radiation (SUMER) spectrometer on the Solar and Heliospheric Observatory (SOHO) recorded spectra from a high-temperature region located in the solar corona above the west limb. These spectra contain lines from rather less-abundant elements in solar plasmas. In this paper we present identiÐcations of the high-temperature K) Ne, (T e º 3 ] 106 Na, Mg, Ar, K, Ca, Ti, Cr, Mn, Fe, Co, and Ni lines that were detected in the 500È1600 spectral range A of SUMER. In addition, accurate wavelength measurements have been obtained with uncertainties varying between 0.015 and 0.040(1 p). Making use of the newly measured wavelengths, we derive A energy levels in the ground conÐguration of a number of highly charged ions. We present intensity ratio calculations of lines in the SUMER range that could be used to measure electron densities in hightemperature solar plasmas. We also provide emissivities for Ca XIIIÈCa XV and Fe XVIIIÈFe XXIII lines that could be used to determine emission measures and electron temperatures of high-temperature plasmas. We discuss a method for measuring elemental abundance variations in high-temperature solar plasmas using lines presented in the paper. A list of spectral lines spanning the 300È30000 wavelength A range and their branching ratios that are suitable for efficiency calibration of space-borne spectrographs is provided.

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RELATIVISTIC DISTORTED-WAVE COLLISION STRENGTHS AND OSCILLATOR STRENGTHS FOR ALL POSSIBLEn= 2–n= 3 TRANSITIONS IN C-LIKE IONS

Zhang

Sampson

1997

Atomic Data and Nuclear Data Tables

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Relativistic distorted-wave collision strengths and oscillator strengths for f-like ions with 22 ≤ Z ≤ 92

Cited by 62 publications

References 21 publications

A fully relativistic approach for calculating atomic data for highly charged ions

A fully relativistic approach for calculating atomic data for highly charged ions

Identification of Spectral Lines in the 500–1600 A Wavelength Range of Highly Ionized Ne, Na, Mg, Ar, K, Ca, Ti, Cr, Mn, Fe, Co, and Ni Emitted by Flares (T_e≥ 3 x 10⁶K) and Their Potential Use in Plasma Diagnostics

RELATIVISTIC DISTORTED-WAVE COLLISION STRENGTHS AND OSCILLATOR STRENGTHS FOR ALL POSSIBLEn= 2–n= 3 TRANSITIONS IN C-LIKE IONS

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Relativistic distorted-wave collision strengths and oscillator strengths for f-like ions with 22 ≤ Z ≤ 92

Cited by 62 publications

References 21 publications

A fully relativistic approach for calculating atomic data for highly charged ions

A fully relativistic approach for calculating atomic data for highly charged ions

Identification of Spectral Lines in the 500–1600 A Wavelength Range of Highly Ionized Ne, Na, Mg, Ar, K, Ca, Ti, Cr, Mn, Fe, Co, and Ni Emitted by Flares (Te≥ 3 x 106K) and Their Potential Use in Plasma Diagnostics

RELATIVISTIC DISTORTED-WAVE COLLISION STRENGTHS AND OSCILLATOR STRENGTHS FOR ALL POSSIBLEn= 2–n= 3 TRANSITIONS IN C-LIKE IONS

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Identification of Spectral Lines in the 500–1600 A Wavelength Range of Highly Ionized Ne, Na, Mg, Ar, K, Ca, Ti, Cr, Mn, Fe, Co, and Ni Emitted by Flares (T_e≥ 3 x 10⁶K) and Their Potential Use in Plasma Diagnostics