Abstract

At low pressures and sufficiently high initial plasma densities (>10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">17</sup> m <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> ), the afterglow is governed by three-body recombination. A characteristic for this process is the formation of highly excited states followed by emission of photons and the appearance of spectral lines not present in the power-on phase. Here, this process has been illustrated using a fast streak camera to record the afterglow spectrum.

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