Fig. 6. Left: The dominant plasma-activation channels in 50 : 50 N2 : O2 stream. Reproduced from ref. 62. Reduced electric fields of 5–100 Td correspond to GA and MW plasmas, while the region above 100 Td corresponds to a DBD reactor.17 Right: The apparent energy cost as function of the χ factor, as proposed by Pei et al.53 Original reference: gliding arc,34,53,62,80,81,91–95 glow discharge,53 spark discharge.53,54.
