C A DeJoseph Jr et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 085701 doi:10.1088/0953-4075/41/8/085701
C A DeJoseph Jr1, V I Demidov2 and J Blessington2
Show affiliationsPlasma emission from the afterglow of a low-pressure, 100% modulated, radio frequency (rf) excited discharge can originate from collisions between metastable atoms and fast electrons. The fast electrons are generated by collisions between pairs of metastables (Penning ionization of one metastable by another) and collisions of metastables with slower electrons (superelastic collisions). Using time-resolved Langmuir probe data, measurements were made of the electron energy distribution function (EEDF) containing these fast electrons in a helium afterglow. The EEDF data were used, along with measured optical cross sections out of the 2s3S and 2s1S metastable levels, to predict intensities of various He emission lines seen in the afterglow. A comparison between the measured and predicted emission is presented.
52.20.Hv Atomic, molecular, ion, and heavy-particle collisions
52.25.Tx Emission, absorption, and scattering of particles
52.70.Ds Electric and magnetic measurements
52.70.Kz Optical (ultraviolet, visible, infrared) measurements
Issue 8 (28 April 2008)
Received 9 November 2007, in final form 21 February 2008
Published 4 April 2008
C A DeJoseph Jr et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 085701
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