scholarly journals Spatially resolved laser-induced fluorescence studies on a three-electrode direct current plasma

1990 ◽  
Vol 5 (2) ◽  
pp. 99 ◽  
Author(s):  
Charles LeBlanc ◽  
Michael W. Blades
Keyword(s):  
Direct Current ◽  
Laser Induced Fluorescence ◽  
Fluorescence Studies ◽  
Spatially Resolved ◽  
Direct Current Plasma

Influence of Water on Spatial Excitation Behavior in the DCP

1993 ◽  
Vol 47 (6) ◽  
pp. 807-811
Author(s):  
Thomas M. Niemczyk ◽  
Chi-Ping Chu
Keyword(s):  
Electron Density ◽  
Direct Current ◽  
Electron Concentration ◽  
Density Increase ◽  
Excitation Temperature ◽  
Spatially Resolved ◽  
Direct Current Plasma ◽  
Analytical Work ◽  
Influence Of Water ◽  
Electron Density Increase

Spatially resolved excitation temperatures and electron densities in the direct-current plasma (DCP) have been measured as a function of the amount of water introduced to the plasma. Both the excitation temperature and the electron density increase with the quantity of water introduced. The increase in these parameters is large for very low water introduction rates, but slows as the amount of water introduced is increased. A plateau is reached where the amount of water introduced no longer affects the electron concentration or excitation temperature. This plateau is reached at a water introduction rate significantly less than that normally used for routine analytical work.

Characterization of an Improved dc Plasma Excitation Source

1980 ◽  
Vol 34 (1) ◽  
pp. 24-30 ◽  
Author(s):  
G. N. Coleman ◽  
W. P. Braun ◽  
A. M. Allen
Keyword(s):  
Thermal Conductivity ◽  
Direct Current ◽  
Direct Evidence ◽  
Plasma Jet ◽  
Sample Introduction ◽  
Direct Current Plasma ◽  
Actual Mechanism ◽  
Improved Stability ◽  
Plasma Excitation

Several modifications of the direct current plasma jet have resulted in significantly enhanced analysis capabilities. Reducing the electrode angle, decreasing the aerosol chimney size, and operating in a diffuse mode with helium have provided improved stability, sensitivity, freedom from interferences, and detection limits. While the actual mechanism of the helium enhancement is not clear, no direct evidence was found which supports participation in the excitation step. Rather, improved desolvation, vaporization and possibly sample introduction result from the thermal conductivity of helium being much greater than that of argon.

Control of implantation area in direct-current plasma immersion ion implantation (DC-PIII)

2003 ◽  
Vol 31 (3) ◽  
pp. 356-361 ◽  
Author(s):  
R.K. Fu ◽  
Pai Peng ◽  
Xuchu Zeng ◽  
D.T. Kwok ◽  
P.K. Chu
Keyword(s):  
Ion Implantation ◽  
Direct Current ◽  
Direct Current Plasma ◽  
Plasma Immersion Ion Implantation
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