Simulation of positive streamers in CO2 and in air: the role of photoionization or other electron sources

@article{Bagheri2020SimulationOP,
  title={Simulation of positive streamers in CO2 and in air: the role of photoionization or other electron sources},
  author={Behnaz Bagheri and Jannis Teunissen and Ute Ebert},
  journal={arXiv: Plasma Physics},
  year={2020}
}
Positive streamer discharges have been studied and modelled extensively in air. Here we study positive streamers in CO$_2$ with and without oxygen admixtures; they are relevant for current high voltage technology as well as for discharges in the atmosphere of Venus. We discuss that no efficient photoionization mechanism is known for gases with a large CO$_2$ fraction, as photons in the relevant energy range are rapidly absorbed. Hence positive streamers can propagate only due to some other… 
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