Observation of characteristic, polarity-dependent, Doppler shifts from neutral species in the positive column of a discharge plasma

Abstract

Articles you may be interested in A hybrid model for particle transport and electron energy distributions in positive column electrical discharges using equivalent species transport

He metastable concentration measurements in a glow discharge

“…As we have described previously [7,8,9] we record paired FTS spectra with opposite discharge polarities but with otherwise identical discharge conditions. Doppler shifts are then determined by comparing the position of lines in the two spectra (∆ν=half the distance between the two oppositely shifted lines).…”

Cation-like Doppler shifts from a neutral molecule in an electrical discharge

“…All its known transitions [14] lie in the near UV range, which is not currently accessible to our experimental facility. Since NO behaves like a positively charged particle, the observed Doppler shifts cannot be due to momentum transferred in the electron-molecule collisions, as already reported for H 2 [5,6] and He [7,8]. Two hypotheses: electron-NO + recombination and momentum transfer in positive ion-molecule collisions, may be examined with more details.…”

“…Polarity-dependent lineshifts from neutrals in glow discharges have already been seldomly reported. They are restricted to Doppler shifts in the light molecules H 2 [5,6] or He [7,8] induced by momentum transferred from colliding electrons. Consequently the neutral behave like anions.…”