Energy levels and spectral lines of tungsten, W III through W LXXIV

Kramida, Alexander; Shirai, Toshizo

doi:10.1016/j.adt.2008.12.002

Cited by 201 publications

(306 citation statements)

References 80 publications

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“…Spectroscopic observations and further collisional data are becoming available now and are summarized in several contributions to the present Special Issue of ATOMS on "Atomic Data for Tungsten". Detailed information about energy levels of singly excited states in tungsten ions has been compiled by Kramida and Shirai [23][24][25] and can be found in the NIST Atomic Spectra Data Base [26].…”

Section: Introductionmentioning

confidence: 99%

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Müller

2015

Atoms

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Collisional processes and details of atomic structure of heavy many-electron atoms and ions are not yet understood in a fully satisfying manner. Experimental studies are required for guiding new theoretical approaches. In response to fusion-related needs for collisional and spectroscopic data on tungsten atoms in all charge states, a project has been initiated in which electron-impact and photon-induced ionization as well as photorecombination of W q+ ions are studied. Cross sections and rate coefficients were determined for charge states q ranging from q = 1 to q = 5 for photoionization, for q = 1 up to q = 19 for electron-impact ionization and for q = 18 to q = 21 for electron-ion recombination. An overview, together with a critical assessment of the methods and results is provided.

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Section: Introductionmentioning

confidence: 99%

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Müller

2015

Atoms

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“…Later on, an experimental observation of W VIII spectrum was performed by Veres et al [17] in emission of tokamak plasma but the low spectral resolution did not allow them to identify the observed broad peaks. However, using the weighted average energies of sub-configurations based on the 4f predicted by Kramida and Shirai [14]. The level identifications reported in [13] were supported by calculations performed using the pseudo-relativistic Hartree-Fock (HFR) method of Cowan [18] combined with a semi-empirical adjustment of the energy parameters.…”

Section: Available Atomic Data In W VIIImentioning

confidence: 99%

“…This lack of knowledge was underlined by Kramida and Shirai [14] who compiled all the classified energy levels and spectral lines of multiply ionized tungsten atoms from W 2+ to W 73+ . In this compilation, it was reminded that it was by the way uncertain whether the ground state of W VIII was 4f P°3/2, making this ion the only known case of p and f orbitals competing for the ground state, as previously noted by Sugar and Kaufman [15].…”

Section: Available Atomic Data In W VIIImentioning

confidence: 99%

Detailed Analysis of Configuration Interaction and Calculation of Radiative Transition Rates in Seven Times Ionized Tungsten (W VIII)

Deprince

Quinet

2015

Atoms

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Abstract:A new set of oscillator strengths and transition probabilities for EUV spectral lines of seven times ionized tungsten (W VIII) is reported in the present paper. These results have been obtained using the pseudo-relativistic Hartree-Fock (HFR) method combined with a semi-empirical optimization of the radial parameters minimizing the discrepancies between computed energy levels and available experimental data. The final physical model considered in the calculations has been chosen further to a detailed investigation of the configuration interaction in this atomic system characterized by complex configurations of the type 4f nl (nl = 5d, 6s).

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“…This strong dependence reflects the charge distribution in the trap. For example, after the electron energy was changed from 630 eV to 675 eV, production of W 23+ became available because the ionization energy of W 22+ is 643 eV [18]. The lines at around 409 and 432 nm, appeared at 675 eV, are thus considered to be emission lines from W 23+ .…”

Section: Survey and Identification Of Previously Unreported Linesmentioning

confidence: 99%

Plasma-Related Atomic Physics with an Electron Beam Ion Trap

Nakamura

2013

Plasma and Fusion Research

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This paper reviews plasma-related atomic physics experiments performed with an electron beam ion trap (EBIT). In particular, activities with two types of EBITs at the University of Electro-Communications are reported after introducing the principle and the design of the devices. Spectroscopic and collisional data which are useful for plasma diagnostics, technology development based on plasmas are presented.

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Energy levels and spectral lines of tungsten, W III through W LXXIV

Cited by 201 publications

References 80 publications

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Fusion-Related Ionization and Recombination Data for Tungsten Ions in Low to Moderately High Charge States

Detailed Analysis of Configuration Interaction and Calculation of Radiative Transition Rates in Seven Times Ionized Tungsten (W VIII)

Plasma-Related Atomic Physics with an Electron Beam Ion Trap

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