scholarly journals Two‐dimensional spectral line emission reconstruction as a plasma diagnostic

1978 ◽  
Vol 49 (5) ◽  
pp. 610-616 ◽  
Author(s):  
B. R. Myers ◽  
Morton A. Levine
Keyword(s):  
Spectral Line ◽  
Line Emission ◽  
Two Dimensional ◽  
Plasma Diagnostic

scholarly journals Spectral line shapes in linear absorption and two-dimensional spectroscopy with skewed frequency distributions

2017 ◽  
Vol 146 (23) ◽  
pp. 234201 ◽  
Author(s):  
Marwa H. Farag ◽  
Bernhard J. Hoenders ◽  
Jasper Knoester ◽  
Thomas L. C. Jansen
Keyword(s):  
Spectral Line ◽  
Two Dimensional ◽  
Linear Absorption ◽  
Frequency Distributions ◽  
Line Shapes

SMA Spectral Line Survey of the Proto-Planetary Nebula CRL 618

2018 ◽  
Vol 14 (S343) ◽  
pp. 483-484
Author(s):  
Nimesh A. Patel ◽  
Carl Gottlieb ◽  
Ken Young ◽  
Tomasz Kaminski ◽  
Michael McCarthy ◽  
...  
Keyword(s):  
Spectral Line ◽  
Planetary Nebula ◽  
Line Emission ◽  
Asymptotic Giant Branch ◽  
60 Ghz ◽  
Agb Stars ◽  
Complex Molecules ◽  
Compact Region ◽  
Line Survey ◽  
Pn Stage

AbstractCarbon-rich Asymptotic Giant Branch (AGB) stars are major sources of gas and dust in the interstellar medium. During the brief (∼1000 yr) period in the evolution from AGB to the Planetary Nebula (PN) stage, the molecular composition evolves from mainly diatomic and small polyatomic species to more complex molecules. Using the Submillimeter Array (SMA), we have carried out a spectral line survey of CRL 618, covering a frequency range of 281.9 to 359.4 GHz. More than 1000 lines were detected in the ∼60 GHz range, most of them assigned to HC3N and c-C3H2, and their isotopologues. About 200 lines are unassigned. Lines of CO, HCO+, and CS show the fast outflow wings, while the majority of line emission arises from a compact region of ∼1” diameter. We have analyzed the lines of HC3N, c-C3H2, CH3CN, and their isotopologues with rotation temperature diagrams.

Two-Dimensional Spatial Distribution of the Time-Integrated Emission from Laser-Produced Plasmas in Air at Atmospheric Pressure

1997 ◽  
Vol 51 (11) ◽  
pp. 1632-1638 ◽  
Author(s):  
C. Aragón ◽  
J. A. Aguilera
Keyword(s):  
Atmospheric Pressure ◽  
Metallic Copper ◽  
Line Emission ◽  
Geometrical Parameters ◽  
Two Dimensional ◽  
Air Plasma ◽  
Maximum Width ◽  
Charge Coupled Device ◽  
Line Intensities ◽  
A Charge

Emission from Nd:YAG laser-produced plasmas generated in air at atmospheric pressure has been studied with spatial resolution. With the use of a charge-coupled device (CCD), two-dimensional spatial distributions of the time-integrated line emission from plasmas of metallic (copper and stainless steel) and ceramic (alumina) samples were measured for laser power densities in the range 80–900 GW/cm2. Geometrical parameters (distance of the maximum, width in two directions) and the total space- and time-integrated emission were obtained as a function of power density. At the range 100–700 GW/cm2, the formation of a plasma in air for the metallic samples was shown to be responsible for a decrease in the total intensity of lines emitted from the sample plasma, accompanied by effects in the spatial profiles along the laser direction. Beyond 700 GW/cm2, a sharp increase of the line intensities was observed, related to the absence of the shielding air plasma.

Density Diagnostic Using Stark Broadening of He I Spectral Line Emission from Rydberg Levels

2006 ◽  
Vol 46 (7-9) ◽  
pp. 661-666 ◽  
Author(s):  
M. Koubiti ◽  
H. Capes ◽  
L. Godbert-Mouret ◽  
Y. Marandet ◽  
A. Meigs ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Emission ◽  
Stark Broadening
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