Commission 14: Atomic and Molecular Data

Wahlgren, G. M.; Dishoeck, E. F. van; Federman, S. R.; Beiersdörfer, P.; Dimitrijević, M. S.; Jorissen, A.; Mashonkina, L.; Nilsson, Hampus; Salama, Farid; Tennyson, Jonathan

doi:10.1017/s1743921312003079

Cited by 4 publications

(4 citation statements)

References 312 publications

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“…The literature provides a wealth of information about this subject, and these experimental and theoretical data were used here. To acquire comprehensive knowledge about this field, the monographies published by the International Astronomical Union (Peach et al 2009;Wahlgren et al 2012) or some reviews about Stark broadening of spectral lines (Lesage 2009) can be consulted.…”

Section: Introductionmentioning

confidence: 99%

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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Context. The Stark broadening of the spectral lines of the wavelengths 501. 6, 667.8, 728.1, 388.9, 587.6, and 706.5 nm from neutral helium in plasmas are studied theoretically and experimentally. Aims. The aim of this work is to provide information about the connection between the shape and width of spectral lines and the electron density and temperature to be used as a diagnostic tool. Methods. The theoretical calculations were carried out through molecular dynamics computer simulations with noninteracting particles. The experimental measurements were done in a plasma of pure helium generated in an electromagnetically driven T-tube. The plasma diagnostics used previous results about the Stark broadening of the He I 447.1 nm and He I 492.2 nm lines and the coherence between the shape of these spectra and those obtained here. The electron temperature was obtained through a Boltzmann-plot of eight lines of Si II. Results. Several tables of width and shift are provided in a wide range of electron density and temperature. Furthermore, we supply several fitting formulas, which allow calculating the plasma electron density from the measured values of the spectral line widths. The results obtained in the laboratory and in the simulations are compared with the data from the literature.

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Section: Introductionmentioning

confidence: 99%

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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“…In the past twenty years Commission 14 was led by Presidents W. H. Parkinson (1994-1997), F. Rostas (1997-2000, P. L. Smith (2000Smith ( -2003, S. Johansson (2003Johansson ( -2006, S. R. Federman (2006-2009), G. M. Wahlgren (2009-2012), and L. Mashonkina (2012. In different triennia, the Organising Committee included seven to twelve members, and the usual practice was for a member to serve for six years.…”

Section: Historical Backgroundmentioning

confidence: 99%

“…The most recent compilations appear in the accompanying set of Commission 14 WG Triennial Reports, which were produced by members of the WGs and the OC (Federman et al 2015;Nave et al 2015;Peach et al 2015;Vidali et al 2015). Triennial Reports for the past triennia, starting from 2000-2003, were published in Transactions IAU (Smith 2003;Johansson et al 2007;Federman et al 2009;Wahlgren et al 2012;Federman et al 2012;Nave et al 2012;Peach & Dimitrijevic 2012;Vidali 2012).…”

Section: Activitymentioning

confidence: 99%

Division B Commission 14: Atomic and Molecular Data

Mashonkina¹,

Salama²,

Wahlgren³

et al. 2015

Proc. IAU

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“…Except for the most prominent features, atomic spectra are virtually unchartered territory for wavelengths in the near-IR region and longer; therefore, high-precision IR wavelength calibration requires continued laboratory analysis (Wahlgren et al 2012). …”

Section: Introductionmentioning

confidence: 99%

Infrared transitions and oscillator strengths of Ca and Mg

Civiš

Ferus

Chernov

et al. 2013

A&A

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Aims. While solar spectra contain a lot of Ca i and Mg i infrared (IR) lines, no laboratory-measured spectra of these atoms have been reported for wavenumbers below 2000 cm −1 . This study reports Ca i spectra in the 1300-4500 cm −1 range and Mg i spectra in the 1300-4500 cm −1 range. Methods. We performed a time-resolved Fourier transform infrared spectroscopy study of a plasma created by the laser ablation of MgF 2 and CaF 2 targets in a vacuum. The oscillator strengths (f-values) were calculated using quantum defect theory (QDT), which shows good agreement with the available experimental and theoretical results.Results. We report several Ca i and Mg i IR lines that have not been measured previously in laboratory. The recorded spectra allow the excitation energies of some Ca i and Mg i states with high orbital momentum (l = 4, 5) to be determined. We also provide a long list of QDT-calculated f-values for Ca i and Mg i in the range of 800-9000 cm −1 .

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Commission 14: Atomic and Molecular Data

Cited by 4 publications

References 312 publications

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Division B Commission 14: Atomic and Molecular Data

Infrared transitions and oscillator strengths of Ca and Mg

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