Measurement of Stark parameters of HeII P\alpha, P\betaand P\gammaspectral lines

Rodrı́guez, F.; Aparicio, J. A.; González, Víctor; Val, J. A. del; Mar, S.

doi:10.1051/0004-6361:20031133

Cited by 4 publications

(3 citation statements)

References 40 publications

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“…It is necessary to obtain isolated profiles of the P β line for a correct processing. In order to achieve this, we used the procedure developed and employed by Rodríguez et al (2003). Experimental spectrum E(λ) is approximated by the mathematical function F (λ)…”

Section: Experimental Results Of P β Linementioning

confidence: 99%

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines

Peláez¹,

Pérez²,

González³

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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Red shifts and asymmetries of He II Pα 468.5682 nm and Pβ 320.3104 nm lines were measured in a pulsed plasma at an electron density measured by two-wavelength interferometry which ranges from 5.54 × 1022 m−3 to 7.48 × 1022 m−3 with uncertainty of 10%. Temperature ranges from 1.70 to 1.83 eV, and has been determined from intensities ratio of Pα and Pβ lines. Shifts for these lines were obtained using as reference lines Cd I 467.8149 nm and He I 318.7745 nm respectively. Measurements of asymmetries have been represented using reduced wavelength units. All results have been compared with previous experimental and theoretical data.

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Section: Experimental Results Of P β Linementioning

confidence: 99%

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines

Peláez¹,

Pérez²,

González³

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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“…Therefore, before 10 µs, only the 5015 Å line is shown in the figure. This emission line has consistently been found to be a reliable electron density probe [45,46]. From 10 µs on, the two other lines become valid with individual results deviating from the respective average by only 4% on average and 18% at most.…”

Section: Electron Densities In Pure Heliummentioning

confidence: 53%

Spectroscopic characterization of laser-produced atmospheric pressure helium microplasmas

Monfared

Graham

Morgan

et al. 2011

Plasma Sources Sci. Technol.

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The temporal evolution of excitation temperature in a laser-produced atmospheric pressure helium plasma is measured and its electron density is explored using a number of different methods. These are the Stark broadening of the He lines at 4026, 4471 and 5015 Å, peak separation and peak intensity ratio of the allowed and forbidden components of the 4471 Å line and Stark broadening of the H β line in hydrogen-helium mixtures. The various results obtained from the helium lines agree within roughly an average factor of 2 at all times. Values obtained from peak separation values differ slightly from the Stark measurements by amounts that depend on the analysis method used. At early delay times, electron density values obtained from the H β line are considerably lower than those from helium lines. Electron density versus temperature curves and temporal evolution of the line intensities indicate that the laser-produced plasma is not in complete thermal equilibrium. Measured electron densities range from ∼10 17 to slightly below 10 15 cm −3 . These are electron densities now being generated in electrically produced microplasmas where the use of spectroscopic techniques is also an important diagnostic tool.

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“…The algorithm used to obtain isolated profiles for these lines has been extensively explained in previous works (Rodríguez et al 2003;Peláez et al 2005). In our work, differences between experimental profiles and best fits are lower than 10%.…”

Section: Data Treatment Results and Discussionmentioning

confidence: 99%

Stark parameters of neutral helium 318.8 nm line

Peláez¹,

González²,

Rodrı́guez³

et al. 2006

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Aims. Our aims is to measure with good accuracy the Stark parameters (width and shift) of the He I 318.8 nm (2s 3 S−4p 3 P o ) line and to calibrate Stark width and shift dependencies of this line as a function of the electron density. In this way, it is possible to obtain an alternative method of diagnosing the plasmas of astrophysical origin and to check the quality of theoretical models that predict these parameters. Methods. We made a spectroscopic and interferometric analysis of a pulsed plasma. The electron temperature was obtained with an intensity ratio of He II lines and ranges from 19 000 to 23 000 K. Electron density was determined by interferometry ranging from 1.25 × 10 22 m −3 to 6.22 × 10 22 m −3 . Results. These experimental results are new for these plasma conditions. When joined with previous bibliographic data, they allowed us to obtain an empirical calibration expression for the Stark width and the shift of this line in a broad range of electron densities. Comparisons with different theoretical models are also included.

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Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Cited by 4 publications

References 40 publications

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines

Spectroscopic characterization of laser-produced atmospheric pressure helium microplasmas

Stark parameters of neutral helium 318.8 nm line

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Measurement of Stark parameters of HeII P\alpha, P\betaand P\gammaspectral lines

Cited by 4 publications

References 40 publications

Experimental measurements of shifts and asymmetries of He II Pαand Pβspectral lines

Experimental measurements of shifts and asymmetries of He II Pαand Pβspectral lines

Spectroscopic characterization of laser-produced atmospheric pressure helium microplasmas

Stark parameters of neutral helium 318.8 nm line

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Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines

Experimental measurements of shifts and asymmetries of He II P_αand P_βspectral lines