Electron density radial profiles derived from Stark broadening in a sodium plasma produced by laser resonance saturation

1987 ◽  
Vol 26 (6) ◽  
pp. 1058 ◽  
Author(s):  
Mark A. Cappelli ◽  
Raymond M. Measures
Keyword(s):  
Electron Density ◽  
Stark Broadening ◽  
Resonance Saturation ◽  
Laser Resonance ◽  
Radial Profiles ◽  
Sodium Plasma

Transient Light Emissions from a Laser Perturbed Plasma

1972 ◽  
Vol 50 (19) ◽  
pp. 2338-2347 ◽  
Author(s):  
H. A. Baldis ◽  
R. A. Nodwell ◽  
J. Meyer
Keyword(s):  
Laser Pulse ◽  
Electron Density ◽  
Laser Light ◽  
Line Emission ◽  
Argon Plasma ◽  
Stark Broadening ◽  
Excited Atoms ◽  
Electron Density Gradient ◽  
Transient Plasma ◽  
The Continuum

The interaction between a 20 MW Q-switched ruby laser pulse and a partially ionized argon plasma has been studied experimentally. When the focused laser pulse is fired into the plasma, a transient emission from the plasma may be observed both in the continuum and line emission. From measurements of the absolute intensities of this transient radiation, estimates have been made of the population density of the excited atoms and of the electron densities. The Stark broadening of the Ar II lines has also been measured to obtain the electron density in the transient plasma and data obtained in this way are consistent with those obtained from the continuum radiation. During the time when the laser light is incident on the plasma the Ar II lines show a strong asymmetry which disappears quickly after the laser pulse has terminated. This asymmetry can be explained in terms of the electron density gradient present in the expanding perturbed plasma.

Experimentelle Untersuchungen zur Stark-Verbreiterung der Balmer-Linien Hα und Hβ / Experimental Investigation of the Stark Broadening of the Balmer Lines Hα and Hβ

1973 ◽  
Vol 28 (11) ◽  
pp. 1794-1800 ◽  
Author(s):  
Horst Ehrich ◽  
Hans Jürgen Kusch
Keyword(s):  
Electron Density ◽  
Plasma Temperature ◽  
Light Sources ◽  
Stark Broadening ◽  
Pulsed Discharge ◽  
Empirical Correction ◽  
Wide Range ◽  
Balmer Lines ◽  
Empirical Correction Factor ◽  
Density Scale

The profiles of the Stark broadened Balmer lines Hα and Hβ have been measured in a wide range of temperature and electron density. By the use of different light sources (3 wallstabilized arcs of different design, a pulsed discharge tube and a plexiglass-capillary discharge) the range was ex- tended to 1.0·104≦T≦3.2·104 °K for the plasma temperature and to 1·1016≦ne≦55·1016 cm−3 for the electron density in the Hβ-scale. The experimental profiles of the Hα-line agree with generalized impact approximations if the condition: ne2/3/T>2·107 cm−2 grad−1 is fulfilled. Disagreements between the Hα and Hβ electron density scale can be removed applying an empirical correction-factor to the electron density obtained from the half-width of Hα.

scholarly journals Spectral Analysis of a White Light Flare

1989 ◽  
Vol 104 (2) ◽  
pp. 247-250
Author(s):  
Boyer R. ◽  
Sotirovski P.
Keyword(s):  
Spectral Analysis ◽  
Solar Flare ◽  
Electron Density ◽  
White Light ◽  
Time Profile ◽  
Crimean Astrophysical Observatory ◽  
Stark Broadening ◽  
Emission Mechanism ◽  
Measured Time ◽  
The Continuum

AbstractWe discuss observations of a solar flare located close to the limb (N15, W75) at 07 00 UT on 26 September 1963 from the Crimean Astrophysical observatory.Stark broadening and hence electron density have been obtained from measured time profile and half-width of the Baliner series lines from Hα to H M.The emission mechanism has been deduced from a study of the continuum intensity as a function of wavelength.

Temporal and Spatial Behavior of Electron Density and Temperature in a Laser-Produced Plasma from YBa2Cu3O7

1998 ◽  
Vol 52 (3) ◽  
pp. 449-455 ◽  
Author(s):  
S. S. Harilal ◽  
C. V. Bindhu ◽  
V. P. N. Nampoori ◽  
C. P. G. Vallabhan
Keyword(s):  
Electron Temperature ◽  
Electron Density ◽  
Spectroscopic Studies ◽  
Spatial Behavior ◽  
Laser Irradiance ◽  
Stark Broadening ◽  
Line Intensities ◽  
Experimental Parameters ◽  
Temporal And Spatial

Spectroscopic studies of laser-induced plasma from a high-temperature superconducting material, viz., YBa2Cu3O7 (YBCO), have been carried out. Electron temperature and electron density measurements were made from spectral data. The Stark broadening of emission lines was used to determine the electron density, and the ratio of line intensities was exploited for the determination of electron temperature. An initial electron temperature of 2.35 eV and electron density of 2.5 × 1017 cm−3 were observed. The dependence on electron temperature and density on different experimental parameters such as distance from the target, delay time after the initiation of the plasma, and laser irradiance is also discussed in detail.

Radial Profiles of Electron Density and Current Components at Cathode Surface in LaB6Hollow Cathode Arc

1987 ◽  
Vol 26 (Part 1, No. 6) ◽  
pp. 919-923 ◽  
Author(s):  
Setsuo Suzuki ◽  
Toshiaki Asano ◽  
Osami Morimiya
Keyword(s):  
Electron Density ◽  
Cathode Surface ◽  
Radial Profiles ◽  
Cathode Arc
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