Stark Broadening of Se IV, Sn IV, Sb IV and Te IV Spectral Lines

Dimitrijević, M. S.; Simić, Zoran; Stamm, R.; Rosato, J.; Milovanović, N.; Yubero, C.

doi:10.3390/atoms6010010

Cited by 8 publications

(7 citation statements)

References 44 publications

(60 reference statements)

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“…Since it is analysed in more details in Dimitrijević et al [18], only basic information will be summarized in this work. The expression for the electron impact full width (FHWM) of an isolated ion line is [12]:…”

Section: The Modified Semiempirical Methodsmentioning

confidence: 99%

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Stark Widths of Na IV Spectral Lines

Dimitrijević

Simić

Valjarević³

et al. 2017

Atoms

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Sodium is a very important element for the research and analysis of astrophysical, laboratory, and technological plasmas, but neither theoretical nor experimental data on Stark broadening of Na IV spectral lines are present in the literature. Using the modified semiempirical method of Dimitrijević and Konjević, here Stark widths have been calculated for nine Na IV transitions. Na IV belongs to the oxygen isoelectronic sequence, and we have calculated Stark widths belonging to singlets, triplets, and quintuplets, as well as with different parent terms. This is used to discuss similarities within one transition array with different multiplicities and parent terms. Additionally, calculated widths will be implemented in the STARK-B database (http://stark-b.obspm.fr) which is also a part of the Virtual Atomic and Molecular Data Center (VAMDC-http://www.vamdc.org/).

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Section: The Modified Semiempirical Methodsmentioning

confidence: 99%

“…is the square of the matrix element, x l k ,l k and x n k ,n k +1 are the ratios of electron kinetic energy and the energy difference between the corresponding energy levels (see [18]), N and T are electron density and temperature, and g(x) [19] and g(x) [12] are the corresponding Gaunt factors.…”

Section: The Modified Semiempirical Methodsmentioning

confidence: 99%

Stark Widths of Na IV Spectral Lines

Dimitrijević

Simić

Valjarević³

et al. 2017

Atoms

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“…Theoretical calculations, using a modified-SE method, of a selection of lines can be found in Ref. [59]. SE calculations for a larger set of transitions are presented in Ref.…”

Section: Sn IVmentioning

confidence: 99%

“…Stark broadening parameters for Sn can be found in various compilations [36][37][38][39]. Detailed spectroscopic work and theoretical calculations on Stark broadening are available for Sn I [40,41], Sn II [42][43][44][45][46][47], Sn III [48,49], Sn I and II [50][51][52][53][54], Sn II and III [29], Sn II, III, IV [55], and Sn IV [56][57][58][59]. Relevant and typically studied electron temperatures are between 1 and 5 eV.…”

Section: Introductionmentioning

confidence: 99%

Time- and space-resolved optical Stark spectroscopy in the afterglow of laser-produced tin-droplet plasma

et al. 2020

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The afterglow emission from Nd:YAG-laser-produced microdroplet-tin plasma is investigated, with a focus on analyzing Stark effect phenomena and the dynamical evolution of the plasma. Time-and space-resolved optical imaging spectroscopy is performed on 11 lines from Sn I-IV ions, in the 315-425-nm wavelength range. Stark shift-to-width ratios serve as the basis for unambiguous experimental tests of atomic physics theory predictions. Experiment and theory, where available, are found to be in poor agreement, and are in disagreement regarding the sign of the ratio in several cases. Spectroscopic measurements of the Stark widths in tandem with Saha-Boltzmann fits to Sn I and Sn II lines, establish the evolution of the local temperature and density of the plasma afterglow, 20-40 ns after the end of the 15-ns-long temporally box-shaped laser pulse. A clear cool-down from ∼2 to 1 eV is observed of the plasma in this time window, having started at ∼30 eV when emitting extremeultraviolet (EUV) light. An exponential reduction of the density of the plasma from ∼10 18-10 17 e − cm −3 is observed in this same time window. Our work is relevant for understanding the dynamics of the decaying, expanding plasma in state-of-the-art EUV nanolithography machines.

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“…Emission of light by neutral tin atoms and lowly charged tin ions, Sn i -Sn v, is abundant in a wide variety of plasmas, ranging from laser-produced extremeultraviolet (EUV) light generating Sn plasma for nanolithography [1,2], divertor plasma when using tin containing materials in future thermonuclear fusion reactors [3][4][5], discharge plasma between tin whiskers causing short-circuits [6], to astrophysical environments [7][8][9][10][11][12][13][14][15]. Spectroscopic investigations on these kinds of plasmas can help characterize plasma parameters [16][17][18][19][20][21][22] such as ion and electron densities and temperatures by studying the observed line strengths and their shapes.…”

Section: Introductionmentioning

confidence: 99%

Energy-level structure ofSn3+ions

et al. 2018

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Laser-produced Sn plasma sources are used to generate extreme ultraviolet (EUV) light in stateof-the-art nanolithography. An ultraviolet and optical spectrum is measured from a droplet-based laser-produced Sn plasma, with a spectrograph covering the range 200 -800 nm. This spectrum contains hundreds of spectral lines from lowly charged tin ions Sn 1+ -Sn 4+ of which a major fraction was hitherto unidentified. We present and identify a selected class of lines belonging to the quasi-one-electron, Ag-like ([Kr]4d 10 nl electronic configuration), Sn 3+ ion, linking the optical lines to a specific charge state by means of a masking technique. These line identifications are made with iterative guidance from cowan code calculations. Of the 53 lines attributed to Sn 3+ , some 20 were identified from previously known energy levels, and 33 lines are used to determine previously unknown level energies of 13 electronic configurations, i.e., 7p, (7, 8)d, (5, 6)f , (6 − 8)g, (6 − 8)h, (7,8)i. The consistency of the level energy determination is verified by the quantum-defect scaling procedure. The ionization limit of Sn 3+ is confirmed and refined to 328 908.4 cm -1 with an uncertainty of 2.1 cm -1 . The relativistic Fock space coupled cluster (FSCC) calculation of the measured level energies are generally in good agreement with experiment, but fail to reproduce the anomalous behavior of the 5d 2 D and nf 2 F terms. By combining the strengths of FSCC, cowan code calculations, and configuration interaction many-body perturbation theory (CI+MBPT), this behavior is shown to arise from interactions with doubly-excited configurations.

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Stark Broadening of Se IV, Sn IV, Sb IV and Te IV Spectral Lines

Cited by 8 publications

References 44 publications

Stark Widths of Na IV Spectral Lines

Stark Widths of Na IV Spectral Lines

Time- and space-resolved optical Stark spectroscopy in the afterglow of laser-produced tin-droplet plasma

Energy-level structure ofSn3+ions

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