Abstract
The potential of employing nitric oxide (NO) as a spectrometric probe to monitor the evolution of free electrons is explored in this article for conditions occurring during the propagation of a positive streamer in atmospheric pressure nitrogen. An extension of the spectroscopic approach, based on a comparison of the relative emission intensity of electronic states with different excitation thresholds is proposed, considering typical space and timescales of streamers. Basic characteristics of electron-impact excitation processes are evaluated for N2(X 1Σg+), N2(C 3Πu) and NO(A 2Σ+) electronic states utilizing recently published cross section data. Emission of the N2 second positive (2.PG) and NO-γ systems is inspected by means of a simple collisional-radiative model considering energetic Maxwellian electrons as the primary excitation source of involved electronic states. A simple tool for evaluating `spectroscopic Maxwellian electron temperature' from relative intensities of the N2 2.PG and NO-γ systems emissions is provided.
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