scholarly journals Spectral Line Intensities for Δ N = 0 (L-Shell) Transitions of N, O, and F-Like Ions

1984 ◽  
Vol 86 ◽  
pp. 258-261
Author(s):  
Y.T. Lee ◽  
K. Reed
Keyword(s):  
High Temperature ◽  
Spectral Line ◽  
Wavelength Range ◽  
Argon Plasma ◽  
Rate Coefficients ◽  
Time Resolved ◽  
High Power Lasers ◽  
Line Intensities ◽  
Radiation Spectra ◽  
Z Pinch

Many laboratories are actively investigating radiation spectra emitted from high temperature/high density plasmas produced using gas-puff Z-pinch machines and high power lasers. Spectral-line intensities from these plasmas can be useful temperature and density diagnostics. In a well-diagnosed plasma, information on the emission spectrum can also be used to test the accuracy of theoretical rate coefficients.Recently time-resolved spectra from an oxygen-like argon plasma produced in a gas-puff z-pinch were measured in the wavelength range 150–200 Å . Over this wavelength range the spectrum contains mostly the Δn = 0 (L-shell) transitions in ArX-ArXIV and some weak transitions for n = 3 to n = 4 of ArVI-ArVIII. The measured spectra show the predominance of 0-like Ar L-shell transitions.

Spectral line intensities calculations for Ne-like argon plasma

1994 ◽  
Author(s):  
L. N. Ivanov ◽  
Elena P. Ivanova ◽  
Larry V. Knight
Keyword(s):  
Spectral Line ◽  
Argon Plasma ◽  
Line Intensities

scholarly journals Enhancement of line X-ray emission from iron plasma created by laser irradiation of porous targets

2011 ◽  
Vol 29 (2) ◽  
pp. 193-200 ◽  
Author(s):  
R. Fazeli ◽  
M.H. Mahdieh ◽  
G.J. Tallents
Keyword(s):  
Spectral Line ◽  
Laser Irradiation ◽  
Wavelength Range ◽  
Maximum Yield ◽  
Ultra Violet ◽  
Selected Lines ◽  
X Ray ◽  
Line Intensities ◽  
Solid Density

AbstractEnhancement of the line X-ray emission from iron plasma is investigated by simulating laser irradiation of both porous and solid targets. Spectral line intensities are calculated for selected lines of the iron plasma within the extreme ultra-violet lithography wavelength range 13.3–13.7 nm. The calculations show that X-ray yield in porous targets can be enhanced significantly in comparison with solid density targets. The results also show that for specified conditions of the driving laser, there are optimums conditions of the porous target in which maximum yield can be obtained.

On the Inhomogeneity of Chemical Composition over the Surface of 21 Per

1976 ◽  
Vol 32 ◽  
pp. 343-349
Author(s):  
Yu.V. Glagolevsky ◽  
K.I. Kozlova ◽  
V.S. Lebedev ◽  
N.S. Polosukhina
Keyword(s):  
Chemical Composition ◽  
Spectral Line ◽  
Variable Star ◽  
Radial Velocities ◽  
Crimean Astrophysical Observatory ◽  
Line Intensities ◽  
Magnetic Variable

SummaryThe magnetic variable star 21 Per has been studied from 4 and 8 Å/mm spectra obtained with the 2.6 - meter reflector of the Crimean Astrophysical Observatory. Spectral line intensities (Wλ) and radial velocities (Vr) have been measured.

High temperature 27Al NMR time resolved study. Application to the CaO-Al2O3 binary system

1995 ◽  
Vol 92 ◽  
pp. 1871-1876 ◽  
Author(s):  
B Touzo ◽  
D Trumeau ◽  
D Massiot ◽  
I Farnan ◽  
JP Coutures
Keyword(s):  
High Temperature ◽  
Binary System ◽  
27Al Nmr ◽  
Time Resolved ◽  
Study Application

Comparative studies of nitrogen plasma and argon plasma treatment on the strength of PBO fibre reinforced high-temperature resistant thermoplastic composite

2021 ◽  
pp. 095400832098729
Author(s):  
K Sudheendra ◽  
Jennifer Vinodhini ◽  
M Govindaraju ◽  
Shantanu Bhowmik
Keyword(s):  
Contact Angle ◽  
High Temperature ◽  
Plasma Treatment ◽  
Sessile Drop ◽  
Dynamic Contact Angle ◽  
Argon Plasma ◽  
Film Surface ◽  
Fibre Surface ◽  
Nitrogen Plasma ◽  
Thermoplastic Composite

The study involves the processing of a novel poly [1, 4-phenylene-cis-benzobisoxazole] (PBO) fibre reinforced high-temperature thermoplastic composite with polyaryletherketone (PAEK) as the matrix. The PBO fibre and the PAEK film surface was modified using the method of argon and nitrogen plasma treatment. The investigation primarily focuses on evaluating the tensile properties of the fabricated laminates and correlating it with the effect of plasma treatment, surface characteristics, and its fracture surface. A 5% decrease in tensile strength was observed post argon plasma treatment while a 27% increase in strength was observed post nitrogen plasma treatment. The morphology of the failure surface was investigated by scanning electron microscopy and an interfacial failure was observed. Furthermore, the effect of plasma on the wettability of PBO fibres and PAEK film surface was confirmed by the Dynamic Contact Angle analysis and sessile drop method respectively. FTIR spectral analysis was done to investigate the effect of plasma treatment on the chemical structure on the surface. The results of the wettability study showed that the argon plasma treatment of the fibre surface increased its hydrophobicity while nitrogen plasma treatment resulted in the reduction of contact angle.

Quantitative FM Spectroscopy at High Temperatures: The Detection of 1CH2 behind Shock Waves

2000 ◽  
Vol 214 (12) ◽  
Author(s):  
G. Friedrichs ◽  
H.Gg. Wagner
Keyword(s):  
High Temperature ◽  
Shock Waves ◽  
High Temperatures ◽  
Frequency Modulation ◽  
Modulation Frequency ◽  
Optical Power ◽  
Time Resolved ◽  
Signal Conversion ◽  
High Modulation ◽  
Singlet Methylene

The technique of time resolved frequency modulation (FM) spectroscopy has been shown to provide a very sensitive means to detect small radicals behind shock waves. Features of high temperature FM spectroscopy behind shock waves will be discussed and a general signal conversion procedure to carry out quantitative concentration measurements will be presented.Using a high modulation frequency, a high modulation index and high total optical power, singlet methylene radicals (α

scholarly journals Time-Resolved Emission Spectroscopy Measurements during the Restrike Period in Arc Plasma Torch

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Alan Mašláni ◽  
Peter Ondáč ◽  
Viktor Sember ◽  
Milan Hrabovský
Keyword(s):  
Plasma Torch ◽  
Temporal Evolution ◽  
Argon Plasma ◽  
Anode Surface ◽  
Temperature Profiles ◽  
Arc Plasma ◽  
Electrical Measurements ◽  
Plasma Properties ◽  
Time Resolved ◽  
Arc Plasma Torch

Simultaneous optical, spectroscopic, and electrical measurements in the region of the arc anode attachment of the water-argon plasma torch are presented. A movement of the arc attachment along the anode surface together with its restrike mode is monitored. Temporal evolution of temperature during one cycle of the restrike mode is obtained in three different axial positions in the plasma column. Resulting temperature profiles show how the position of the arc attachment influences the plasma properties.

Time‐resolved x‐ray line intensities for diagnostics of laser‐produced plasmas (abstract)

1985 ◽  
Vol 56 (5) ◽  
pp. 844-844 ◽  
Author(s):  
R. L. Kauffman ◽  
H. Medecki ◽  
R. W. Lee ◽  
B. L. Whitten ◽  
K. G. Estabrook ◽  
...  
Keyword(s):  
Time Resolved ◽  
X Ray ◽  
Line Intensities
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