Analysis of cold atmospheric-pressure bio-medicine plasmas by using UV absorption spectroscopy

The hydroxyl radical density and its distribution have been investigated and measured to be the maximum value of 1.68 × 1015 cm− 3 with Ar flow rate 8 l/min and 2.17 × 1015 cm− 3 with Ar flow rate 3.5 l/min for the Medi-Plasma head and the needle-typed cold atmospheric-pressure plasma jet, respectively. The maximum OH concentration of Medi-Plasma head occurs at the origin and decrease as radial distance increases while the farthest density for plasma jet is obtained at 0.5 mm of the radial distance.