https://doi.org/10.1088/1361-6595/ae4d88 https://doi.org/10.34657/39517 optical emission spectra applied voltage pulse frequencies voltage rise time intenllical 2 0 circuit plasma feedback external electric field soda lime glass dielectric oes line ratios pre breakdown instabilities charged particle densities electron thermal velocity stokes flow regime surface reaction rates gain of electrons negative screening charge Low Temperature Plasma Research