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Analysis of time-resolved optical emission of He cryoplasma at atmospheric pressure

Cryogenic plasma, so-called cryoplasma, was generated under helium at atmospheric pressure at temperatures ranging between room temperature and 79 K. Time-resolved emission spectra of the main species of the He cryoplasmas were measured in order to analyse the optical characteristics that can define the discharge mode. The experimental results clearly show that a decrease in temperature changes the temporal variation of radiation of the measured species and induces a transition of the discharge mode, from pseudoglow to glow, and then to Townsend discharge. This result reconfirms the scenario of temperature-dependent mode transition of cryoplasma.