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Time-dependence of the electron energy distribution function in the nitrogen afterglow

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7 Author(s)
Guerra, V. ; Centro de Fisica dos Plasmas, Inst. Superior Tecnico, Lisboa, Portugal ; Dias, F.M. ; Loureiro, J. ; Paulo Araujo Sa
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In this paper, we present an investigation of the time-relaxation of the electron energy distribution function (EEDF) in the nitrogen afterglow of an ω/2π=433 MHz flowing discharge at p=3.3 torr, in a tube with inner radius R=1.9 cm. We solve the time-dependent Boltzmann equation, including the term for creation of new electrons in associative/Penning reactions, coupled to a system of rate balance equations for the heavy-particles. The EEDFs are also obtained experimentally, from second derivatives of digitized probe characteristics measured using a triple probe technique, and compared with the calculations. It is shown that an equilibrium between the vibrational distribution function of ground-state molecules N2(X1Σg+,v) and low-energy electrons is rapidly established, in times ∼10-7 s. In these early instants of the postdischarge, a dip is formed in the EEDF around 4 eV. The EEDF finally reaches a quasi-stationary state for t≳10-6 s, although the electron density still continues to decrease beyond this instant. Collisions of highly excited N2(X1Σg+,v≳35) molecules with N(4S) atoms are in the origin of a maximum in the electron density occurring downstream from the discharge at ≃2×10-2 s. These reactions create locally the metastable states N2(A3Σu+) and N2(a'1Σu-), which in turn ionize the gas in associative/Penning processes. Slow electrons remain for very long times in the postdischarge and can be involved in electron stepwise processes with energy thresholds smaller than ∼2-3 eV.

Published in:

Plasma Science, IEEE Transactions on  (Volume:31 ,  Issue: 4 )

Date of Publication:

Aug. 2003

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