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Non-local effects in spatial distribution of excitation rates in positive column of glow discharge plasma of molecular gases. / Kudryavtsev, A.A.; Bogdanov, E.A.; Tsendin, L.D.
In: Bulletin of the American Physical Society, Vol. 53, No. 10, 2008, p. 53.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Non-local effects in spatial distribution of excitation rates in positive column of glow discharge plasma of molecular gases
AU - Kudryavtsev, A.A.
AU - Bogdanov, E.A.
AU - Tsendin, L.D.
PY - 2008
Y1 - 2008
N2 - At simulations of gas-discharge plasmas the electron distribution function (EDF) is usually calculated using a local approximation (LA) which is applicable only when electron energy relaxation length \textit{le} $<\quad R -- $plasma size. For atomic gases \textit{le} $> \quad 100l$ ($l$ -- electron free-path-length), so the LA for EDF is not valid up to high pressures. By contrast, in molecular gases due to strong vibrational excitation with low energy threshold, the length \textit{le} is small \textit{le$\sim $l}. And so it is assumed everywhere that the LA for EDF calculation in molecular gases is valid in any cases when diffusive approximation $R $>$ l $ is applicable. In this report it is shown that in molecular gases local approximation is inapplicable on the discharge periphery, where ambipolar field exceeds longitudinal field. A heating of fast electrons in ambipolar field gives rise to excitation constants from centre to periphery of discharge.
AB - At simulations of gas-discharge plasmas the electron distribution function (EDF) is usually calculated using a local approximation (LA) which is applicable only when electron energy relaxation length \textit{le} $<\quad R -- $plasma size. For atomic gases \textit{le} $> \quad 100l$ ($l$ -- electron free-path-length), so the LA for EDF is not valid up to high pressures. By contrast, in molecular gases due to strong vibrational excitation with low energy threshold, the length \textit{le} is small \textit{le$\sim $l}. And so it is assumed everywhere that the LA for EDF calculation in molecular gases is valid in any cases when diffusive approximation $R $>$ l $ is applicable. In this report it is shown that in molecular gases local approximation is inapplicable on the discharge periphery, where ambipolar field exceeds longitudinal field. A heating of fast electrons in ambipolar field gives rise to excitation constants from centre to periphery of discharge.
M3 - статья
VL - 53
SP - 53
JO - Bulletin of the American Physical Society
JF - Bulletin of the American Physical Society
SN - 0003-0503
IS - 10
ER -
ID: 5236029