Sensitivity comparison in a microwave-induced plasma gas chromatographic detector: effect of plasma torch design

1992 ◽  
Vol 64 (5) ◽  
pp. 541-544 ◽  
Author(s):  
Rosa M. Alvarez Bolainez ◽  
Michael P. Dziewatkoski ◽  
Charles B. Boss
Keyword(s):  
Plasma Torch ◽  
Microwave Induced Plasma ◽  
Torch Design ◽  
Detector Effect

scholarly journals Influence of Plasma Torch Design on Cutting Quality during Precision Air-Plasma Cutting of Metal

2020 ◽  
Vol 50 (3) ◽  
pp. 159-165 ◽  
Author(s):  
S. V. Anakhov ◽  
B. N. Guzanov ◽  
A. V. Matushkin ◽  
N. B. Pugacheva ◽  
Yu. A. Pykin
Keyword(s):  
Plasma Torch ◽  
Plasma Cutting ◽  
Air Plasma ◽  
Torch Design

DC Plasma Torch Design and Performance

2017 ◽  
pp. 1-63
Author(s):  
Maher I. Boulos ◽  
Pierre Fauchais ◽  
Emil Pfender
Keyword(s):  
Plasma Torch ◽  
Dc Plasma ◽  
Torch Design ◽  
And Performance

A Comparative Study of Rotational Temperatures in a Microwave Plasma: OH Radical versus N2+

1988 ◽  
Vol 42 (1) ◽  
pp. 96-100 ◽  
Author(s):  
John M. Workman ◽  
P. A. Fleitz ◽  
Harry B. Fannin ◽  
Joseph A. Caruso ◽  
C. J. Seliskar
Keyword(s):  
Comparative Study ◽  
Microwave Plasma ◽  
Rotational Temperature ◽  
Molecular Nitrogen ◽  
Oh Radical ◽  
Microwave Induced Plasma ◽  
Torch Design ◽  
Nitrogen Ion ◽  
Increasing Temperature

A rotational temperature comparative study of OH radical vs. N2+ was carried out on a low-power helium microwave-induced plasma. Under the prevailing conditions, N2+ was found to provide twice as many usable lines for temperature measurement than did hydroxyl radical. For the particular torch design used, both species exhibited slightly increasing rotational temperatures at lower flow rates. At fixed conditions, OH consistently indicated higher rotational temperatures than those of the molecular nitrogen ion. Positional studies revealed a slightly increasing temperature near the center of the plasma. This work suggests that N2+ may provide a number of advantages over OH radical as a thermometric probe species in the determination of plasma rotational temperature.

Characteristics of a Kilowatt-Plus Helium Microwave-Induced Plasma Utilizing 2- and 3-cm-Depth TM010 Resonator Cavities

1992 ◽  
Vol 46 (1) ◽  
pp. 163-168 ◽  
Author(s):  
Mingin Wu ◽  
Jon W. Carnahan
Keyword(s):  
Plasma Torch ◽  
Energy Coupling ◽  
Analytical Performance ◽  
Plasma Energy ◽  
Microwave Induced Plasma ◽  
Resonator Cavity ◽  
Aqueous Chloride

A kilowatt-plus microwave-induced plasma (KiP-MIP) system was modified for better analytical performance. Modifications included the use of a redesigned plasma torch and a new plasma resonator cavity. The use of the redesigned plasma torch improved the detection of aqueous chloride by 2 orders of magnitude. With the redesigned plasma torch, the performance of the KiP-MIP utilizing the original 3-cm-depth and 2-cm-depth resonator cavities were studied. Results indicated that the KiP-MIP with the 2-cm-depth resonator cavity exhibited better characteristics in terms of plasma energy coupling, excitation characteristics, and determination of aqueous chloride.

Spectroscopic Temperature Determinations for a Microwave-Induced Helium Plasma Formed in a Laminar Flow Torch

1986 ◽  
Vol 40 (6) ◽  
pp. 857-863 ◽  
Author(s):  
John M. Workman ◽  
Peter G. Brown ◽  
David C. Miller ◽  
C. J. Seliskar ◽  
Joseph A. Caruso
Keyword(s):  
Laminar Flow ◽  
Rotational Temperature ◽  
Plasma Diagnostic ◽  
Diagnostic Investigation ◽  
Microwave Induced Plasma ◽  
Torch Design ◽  
Temperature Slope ◽  
Stable Plasma ◽  
Lower Temperature ◽  
Plasma Emission Spectroscopy

This study represents the first plasma diagnostic investigation of a laminar flow torch configuration for microwave-induced plasma emission spectroscopy. Spatial intensity profiles indicate that this torch design facilitates the formation of a stable plasma discharge which does not reside on the walls of the plasma containment tube. Spectroscopic temperature determinations were based on the assumption of local thermodynamic equilibrium. Excitation temperatures were found to be several thousand degrees higher than those reported for other low-power He plasmas. Rotational temperature determinations afforded bimodal temperature distributions from the Boltzmann plots, with lower temperature slope regions comparable to values reported by others. Rotational temperatures derived from high-temperature slope regions were several thousand degrees above values obtained in other studies. Temperatures were evaluated as a function of radial position, microwave power, and flow rate.

A High-Pressure Inductively Coupled Plasma Torch

1987 ◽  
Vol 41 (4) ◽  
pp. 654-657 ◽  
Author(s):  
Thomas R. Smith ◽  
M. Bonner Denton
Keyword(s):  
Atmospheric Pressure ◽  
Inductively Coupled Plasma ◽  
Plasma Torch ◽  
Detection Limits ◽  
Operating Pressure ◽  
Inductively Coupled ◽  
Matching Networks ◽  
Torch Design ◽  
Increased Sensitivity ◽  
Icp Torch

An inductively coupled plasma (ICP) torch utilizing an extended coolant tube that tapers down to a small exit orifice designed to increase the pressure within the ICP torch is described. This torch design makes use of the advantages associated with higher torch operating pressures (including improved detection limits, increased sensitivity, and better plasma stability), without requiring major modifications to existing commercially available ICP torch box and matching networks. Detection limits obtained with the use of the new torch design are compared with those obtained from several commonly used torch designs using a commercially available torch box and spectrometer. A two- to sevenfold improvement in detection limits is observed through increasing torch operating pressure from 101.325 KPa (760 Torr, or atmospheric pressure) to 120 KPa (900 Torr).

Evaluation of a Demountable Tangential Flow Torch for Microwave-Induced Plasma Atomic Emission Spectrometry

1993 ◽  
Vol 47 (7) ◽  
pp. 994-998 ◽  
Author(s):  
K. A. McCleary ◽  
G. R. Ducatte ◽  
D. H. Renfro ◽  
G. L. Long
Keyword(s):  
Packed Column ◽  
Argon Plasma ◽  
Atomic Emission ◽  
Emission Spectrometry ◽  
Plasma Atomic Emission Spectrometry ◽  
Specific Detection ◽  
Flow Measurements ◽  
Microwave Induced Plasma ◽  
Tangential Flow ◽  
Torch Design

A demountable torch for the microwave-induced plasma that utilizes a tangential flow pattern is described. This new torch is compared to a conventional all-quartz design in a series of comparative studies. Diagnostic studies consist of measurements of electron number densities, excitation temperatures, and ionization temperatures of an argon plasma generated in each torch. Hydrodynamic flow measurements, vertical emission profiles, and limits of detection provide further contrast between the characteristics of the demountable design and conventional all-quartz torch. The compatibility of the new torch design with supercritical CO, flows is demonstrated where the MIP is coupled with a packed-column supercritical fluid chromatograph for the purpose of element-specific detection. The physical advantages of the demountable torch over the all-quartz design are discussed.

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