Deviation from local thermal equilibrium in an atmospheric argon arc plasma

J. Leclair; D.C. Schram

Deviation from local thermal equilibrium in an atmospheric argon arc plasma

J. Leclair, D.C. Schram

Plasma & Materials Processing

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

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Abstract

The electron temperature T/sub e/ is obtained from five optically non-thin Ar I line-transitions. It is possible to measure T/sub e/ without any knowledge of transition probabilities. The electron density N/sub e/ can be calculated from measured excited level densities using the partial LTE model. It appears that there is a functional dependence of N/sub e/ on T/sub e/, suggesting that transport processes are of only minor importance. The deviations from LTE can be described by assuming a N/sub e/-dependent overpopulation of the ground level of Ar I. This overpopulation factor varies from 1.9 for N/sub e/=2*10/sup 16/ cm/sup -3/ to 1.25 for N/sub e/=2*10/sup 17/ cm/sup -3/

Original language	English
Title of host publication	ICPIG : International Conference on Phenomena in Ionized Gases : proceedings, 13th, Berlin, September 12-17, 1977, contributed papers II
Place of Publication	Leipzig, East Germany
Publisher	Physical Society, German Democratic Republic
Pages	483-484
Publication status	Published - 1977

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title = "Deviation from local thermal equilibrium in an atmospheric argon arc plasma",

abstract = "The electron temperature T/sub e/ is obtained from five optically non-thin Ar I line-transitions. It is possible to measure T/sub e/ without any knowledge of transition probabilities. The electron density N/sub e/ can be calculated from measured excited level densities using the partial LTE model. It appears that there is a functional dependence of N/sub e/ on T/sub e/, suggesting that transport processes are of only minor importance. The deviations from LTE can be described by assuming a N/sub e/-dependent overpopulation of the ground level of Ar I. This overpopulation factor varies from 1.9 for N/sub e/=2*10/sup 16/ cm/sup -3/ to 1.25 for N/sub e/=2*10/sup 17/ cm/sup -3/",

author = "J. Leclair and D.C. Schram",

year = "1977",

language = "English",

pages = "483--484",

booktitle = "ICPIG : International Conference on Phenomena in Ionized Gases : proceedings, 13th, Berlin, September 12-17, 1977, contributed papers II",

publisher = "Physical Society, German Democratic Republic",

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Deviation from local thermal equilibrium in an atmospheric argon arc plasma. / Leclair, J.; Schram, D.C.

ICPIG : International Conference on Phenomena in Ionized Gases : proceedings, 13th, Berlin, September 12-17, 1977, contributed papers II. Leipzig, East Germany : Physical Society, German Democratic Republic, 1977. p. 483-484.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › Academic

TY - GEN

T1 - Deviation from local thermal equilibrium in an atmospheric argon arc plasma

AU - Leclair, J.

AU - Schram, D.C.

PY - 1977

Y1 - 1977

N2 - The electron temperature T/sub e/ is obtained from five optically non-thin Ar I line-transitions. It is possible to measure T/sub e/ without any knowledge of transition probabilities. The electron density N/sub e/ can be calculated from measured excited level densities using the partial LTE model. It appears that there is a functional dependence of N/sub e/ on T/sub e/, suggesting that transport processes are of only minor importance. The deviations from LTE can be described by assuming a N/sub e/-dependent overpopulation of the ground level of Ar I. This overpopulation factor varies from 1.9 for N/sub e/=2*10/sup 16/ cm/sup -3/ to 1.25 for N/sub e/=2*10/sup 17/ cm/sup -3/

AB - The electron temperature T/sub e/ is obtained from five optically non-thin Ar I line-transitions. It is possible to measure T/sub e/ without any knowledge of transition probabilities. The electron density N/sub e/ can be calculated from measured excited level densities using the partial LTE model. It appears that there is a functional dependence of N/sub e/ on T/sub e/, suggesting that transport processes are of only minor importance. The deviations from LTE can be described by assuming a N/sub e/-dependent overpopulation of the ground level of Ar I. This overpopulation factor varies from 1.9 for N/sub e/=2*10/sup 16/ cm/sup -3/ to 1.25 for N/sub e/=2*10/sup 17/ cm/sup -3/

M3 - Conference contribution

SP - 483

EP - 484

BT - ICPIG : International Conference on Phenomena in Ionized Gases : proceedings, 13th, Berlin, September 12-17, 1977, contributed papers II

PB - Physical Society, German Democratic Republic

CY - Leipzig, East Germany

ER -