“…It may also be obtained by using neutral gases during the process (Stepczy nska & _ Zenkiewicz, 2014). The increase in electron density and the curvature of the electrode's wire cause the increase in density of positive ions (Brzezi nski et al, 2009;Kim, 1996;Kulumbaev et al, 2011;Ozdemir et al, 1999;Skalny, Luknárová, & Dindo sová, 1988;Sparavigna & Wolf, 2006;Stasyuk & Pyatetskii, 1993;_ Zenkiewicz & Lutomirski, 2001). Therefore, in order to obtain a higher level of activation, one should reduce the speed of the process (Stasyuk & Pyatetskii, 1993).…”