Determination of electron density and temperature in non‐LTE plasmas from spectral lines of impurity ions

1988 ◽  
Vol 63 (3) ◽  
pp. 656-664 ◽  
Author(s):  
Joseph A. Kunc
Keyword(s):  
Electron Density ◽  
Spectral Lines ◽  
Impurity Ions ◽  
Electron Density And Temperature

scholarly journals Experimental stark widths and shifts of V II spectral lines

2020 ◽  
Vol 498 (2) ◽  
pp. 2068-2074 ◽  
Author(s):  
J Manrique ◽  
D M Díaz Pace ◽  
C Aragón ◽  
J A Aguilera
Keyword(s):  
Electron Density ◽  
Wavelength Range ◽  
Spectral Lines ◽  
Electron Density And Temperature ◽  
And Shifts

ABSTRACT We have measured the Stark widths and shifts of V II spectral lines in the wavelength range 2000–4200 Å belonging to 75 multiplets. The spectra are emitted by laser-induced plasmas generated from fused glass discs prepared by borate fusion. The electron density and temperature are in the ranges (0.72–6.5) × 1017 cm−3 and (11 000–14 900) K, respectively. To avoid self-absorption, we have used seven samples with vanadium concentrations selected by the CSigma graph methodology. This has allowed to include strong and weak lines in the study, including resonance and forbidden lines. The experimental widths and shifts are compared with theoretical values available in the literature.

scholarly journals Measurement of Electron Density from Stark-Broadened Spectral Lines Appearing in Silver Nanomaterial Plasma

Atoms ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 44 ◽  
Author(s):  
Ashraf EL Sherbini ◽  
Ahmed EL Sherbini ◽  
Christian Parigger
Keyword(s):  
Electron Density ◽  
Optical Breakdown ◽  
Optical Emission ◽  
Spectral Lines ◽  
Photon Absorption ◽  
Balmer Series ◽  
Line Asymmetry ◽  
Atomic Lines ◽  
532 Nm

This work communicates results from optical emission spectroscopy following laser-induced optical breakdown at or near nanomaterial. Selected atomic lines of silver are evaluated for a consistent determination of electron density. Comparisons are presented with Balmer series hydrogen results. Measurements free of self-absorption effects are of particular interest. For several silver lines, asymmetries are observed in the recorded line profiles. Electron densities of interest range from 0.5 to 3 × 1017 cm−3 for five nanosecond Q-switched Nd:YAG radiation at wavelengths of 1064 nm, 532 nm, and 355 nm and for selected silver emission lines including 328.06 nm, 338.28 nm, 768.7 nm, and 827.3 nm and the hydrogen alpha Balmer series line at 656.3 nm. Line asymmetries are presented for the 328.06-nm and 338.28-nm Ag I lines that are measured following generation of the plasma due to multiple photon absorption. This work explores electron density variations for different irradiance levels and reports spectral line asymmetry of resonance lines for different laser fluence levels.

scholarly journals Observations of Infrared Fine-Structure Lines: [S III]

1978 ◽  
Vol 76 ◽  
pp. 126-126
Author(s):  
Lawrence T. Greenberg
Keyword(s):  
Fine Structure ◽  
Electron Density ◽  
Experimental Error ◽  
Column Density ◽  
Surface Brightness ◽  
Ngc 7027 ◽  
Structure Line ◽  
Electron Density And Temperature ◽  
Fine Structure Lines

Recent observations of the 18.7 ym fine-structure line of S++ in NGC 7027 and BD+30°3639 (Greenberg, Dyal and Geballe, 1977 Ap.J.(Letters), 213, L74) allow the first determination of an ionic column density in ionized nebulae. The line ratios 18.7 μm/A9532 and λ6312/λ9532, besides yielding both electron density and temperature in the S++ region, have been used to indicate that the fine-structure levels of S++ are collisionally saturated. In this case the 18.7 ym surface brightness directly measures the column density of S++ ions with little dependence upon nebular structure, the major uncertainty being the experimental error. This research has been partially supported by NASA Grants NGR 05-003-511 and NGL 05-003-272.

Sign in / Sign up

Export Citation Format

Share Document