Division Xii / Commission 14 / Working Group Collision Processes

Peach, G.; Dimitrijević, M. S.; Stancil, P. C.

doi:10.1017/s1743921308025957

Cited by 4 publications

(3 citation statements)

References 308 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 simulating the Solar Wind X-ray and EUV, systematical and accurate charge exchange cross sections are required, but the available experimental and theoretical data are very limited [4][5], especially for state-selective charge exchange cross sections.…”

Section: Synopsismentioning

confidence: 99%

Theoretical investigations of collisions between highly charged ions and atomic H and He

Liu

Wang

et al. 2014

J. Phys.: Conf. Ser.

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“…Since the pioneering work of Griem (e.g., Griem 1960), theoretical approaches for computing spectral line widths have been refined (see e.g., Watson 2006;Peach 2015), and so have the ways of testing them in space and laboratory observations (see, e.g., Peach et al 2009;Lisitsa et al 2012). Radio recombination lines (RRLs) have been used for testing Stark broadening theory since the 1960s (Gordon & Sorochenko 2009).…”

Section: Introductionmentioning

confidence: 99%

Stark Broadening of High-Order Radio Recombination Lines Toward the Orion Nebula

Alexander

Gulyaev

2016

ApJ

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We report the results of observations and analyses of 41 D = ¼ n 1, , 5 hydrogen radio recombination lines from the Orion nebula (M42) at 5.5 to 6.5 GHz, with a spectral sensitivity (channel-to-channel standard deviation) of »2 mJy. Observations were conducted at the Australia Telescope Compact Array. A 1 GHz bandwidth allowed simultaneous detection of up to 11 spectral lines of equal Dn that were stacked to enable accurate measurement of line widths. Collisional widths in the range of principal quantum numbers n from 100 to 179 are found to be consistent with predictions of electron impact Stark broadening theory. An Orion nebula model with density inhomogeneities (clumps) and gradients of temperature and density is consistent with our data. We reanalyze the data of Smirnov et al. and Bell et al. and find excellent agreement between all statistically significant measurements and theory. Our findings confirm the absence of line narrowing for n=100...179.

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Division Xii / Commission 14 / Working Group Collision Processes

Cited by 4 publications

References 308 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

Theoretical investigations of collisions between highly charged ions and atomic H and He

Stark Broadening of High-Order Radio Recombination Lines Toward the Orion Nebula

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