<i>Plasma Diagnostics</i>

Lochte‐Holtgreven, W.; Malamud, Herbert

doi:10.1063/1.3022256

Cited by 54 publications

(72 citation statements)

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“…Spectroscopically, ne can be measured using different experimental techniques that 39 include: measurement of the optical refractivity of the plasma [4, 5,6,7], calculation of the principal 40 quantum number at the series limit [4, 5,6,7], measurement of the absolute emission coefficient 41 (spectral intensity in Watt/ m 3 sr) of a spectral line [8], and measurement of the absolute emissivity of 42 the continuum emission (Watt/ m 3 sr) [8]. However, measurement of Stark broadening of emitted 43 lines for ne determination has been the widely utilized [4,5,6,7,8]. Gaussian spectral line shapes -Voigt function -allows one to extract the Stark full width at half 51 maximum (FWHM).…”

Section: Introduction 28mentioning

confidence: 99%

“…Typically, 31 high peak power, nominal nanosecond radiation is focused to irradiance levels of the order of a few 32 MW/cm 2 to TW/cm 2 , and the emitted light is analyzed with spectrometers and usually gated array 33 detectors [2,3]. Historically, laser-induced plasma spectroscopy (LIPS) explores the physics of the 34 plasma induced by laser light via optical emission spectroscopy (OES) [4,5,6,7]. Spectral line shape 35 analysis via OES leads to determination of at least one characteristic plasma parameter, namely, 36 electron density, ne.…”

Section: Introduction 28mentioning

confidence: 99%

“…252 In the previously reported experiments, there was no recognizable trend of the line asymmetry 287 variation with either laser fluence or electron density. However, for an explanation of the observed 288 phenomena, one should consider effects associated with internally generated micro electro-magnetic 289 fields [4, 5,6,7,30]. 290…”

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confidence: 99%

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Measurement of Electron Density from Stark-Broadened Nanomaterial Plasma

Am¹,

Parigger²

2018

Preprint

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Section: Introduction 28mentioning

confidence: 99%

Section: Introduction 28mentioning

confidence: 99%

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Measurement of Electron Density from Stark-Broadened Nanomaterial Plasma

Am¹,

Parigger²

2018

Preprint

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“…Taking into account that the plasma is transparent for the studied lines [7], and apart from geometrical factors, the line intensity is proportional to the emission transition probability of the line (∼ 10 8 s −1 ) and to the population of the upper excited state of the line. For our geometrical setup, a density of excited species ∼ 10 5 −10 6 cm −3 is enough to give an intense register (close to saturation) in the detector.…”

Section: Discussion and Final Remarksmentioning

confidence: 99%

Spectroscopic measurements in a titanium vacuum arc with different ambient gases

Grondona¹,

Kelly²,

Pelloni³

et al. 2004

Braz. J. Phys.

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Spectral emission lines from a low pressure d-c arc discharge with a Ti cathode were studied in various ambient gases; N2, O2, and Ar. Light from the plasma was detected by an optical spectrometer multichannel analyzer (OSMA). The spectral intensities of Ti, Ti + , Ar and N 2 were measured as a function of the gas pressure in the range 5 × 10 −3 − 0.5 mbar. The measurements were performed in the inter-electrode region at different distances from the cathode. For N2 and O2 as the filling gases, the intensities of Ti and Ti + increase with the gas pressure up to pressure values of the order of 0.2−0.4 mbar, while they decrease for higher pressure values. With Ar gas, a different behavior of the Ti + intensity was found; it presents an increasing general trend. The behavior of the lines was qualitatively analyzed in terms of the most relevant atomic processes that take place in the metallic plasma -gas structure (charge-exchange, electron impact excitation and ionization, etc.). It is found that the behavior of the observed spectral lines can be satisfactorily explained in terms of the relevance of these processes as functions of the neutral gas density and electron temperature.

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“…to determine the internal parameters or to understand the microscopic processes within the plasma [1,2]. Helium spectral lines can be used for diagnostics of laboratory plasmas such as shock wave tube or pulsed arc plasmas [3][4][5][6], and in the astrophysical context, of stellar atmospheres of hot stars and white dwarfs [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Neutral helium spectral lines in dense plasmas

et al. 2006

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Shift and broadening of isolated neutral helium lines 7281Å (2 1 P − 3 1 S), 7065Å (2 3 P − 3 3 S), 6678Å (2 1 P − 3 1 D), 5048Å (2 1 P − 4 1 S), 4922Å (2 1 P − 4 1 D) and 4713Å (2 3 P − 4 3 S) in a dense plasma are investigated. Based on a quantum statistical theory the electronic contributions to the shift and width are considered, using the method of thermodynamic Green functions. Dynamic screening of the electron-atom interaction is included. Compared to the width, the electronic shift is more affected by dynamical screening. This effect is increasing at high density. A cut-off procedure for strong collisions is used. The contribution of the ions is taken into account in a quasi-static approximation, with both the quadratic Stark effect and the quadrupole interaction included. The results for shift and width agree well with the available experimental and theoretical data.

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Plasma Diagnostics

Cited by 54 publications

References 0 publications

Measurement of Electron Density from Stark-Broadened Nanomaterial Plasma

Measurement of Electron Density from Stark-Broadened Nanomaterial Plasma

Spectroscopic measurements in a titanium vacuum arc with different ambient gases

Neutral helium spectral lines in dense plasmas

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