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(Color online) Images of a submicrosecond pulsed atmospheric glow discharge in a barrier-free helium gap of , taken with exposure times of (a) and (b) .
(Color online) Current-voltage characteristics of (a) a submicrosecond pulsed APGD and (b) an atmospheric DBD, both generated with the same electrode unit and in an identical flow.
(Color online) Optical emission spectra of (a) the pulsed barrier-free APGD of Fig. 2(a) and (b) the atmospheric DBD of Fig. 2(b), both at an applied voltage of . The inserted diagram in (a) shows the optical intensity of oxygen atoms at as a function of the applied voltage.
(Color online) Nanosecond resolved optical signatures of three excited plasma species together with the current (green) and dissipated power (red) traces.
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