Presentation Information
[10p-N323-12]Mass Spectrometric Analysis of Reaction Processes of the Ions Generated by Atmospheric Pressure Plasmas
〇(B)Kokone Michikura1, Kenkichi Nagato1, Hirofumi Kurita2 (1.Natl. Inst. Tech. Kochi Col., 2.Toyohashi Univ. Tech.)
Keywords:
Atmospheric Pressure Plasma,Mass Spectrometry,Reactive Species
Atmospheric pressure plasmas are promising for medical and agricultural use, where reactive oxygen and nitrogen species (RONS) generated by plasma play critical roles. The addition of O2 or N2 to the carrier gas alters the composition of these species, but the underlying ion formation mechanisms remain unclear. In this study, we investigated changes in ion species using an atmospheric pressure plasma jet (APPJ) by API-MS. The APPJ was driven by a 10-14 kVp-p, 10 kHz bipolar pulse using a quartz tube with external electrodes. When O2 (10-30 sccm) was added to He (3.0 slm), various ion peaks were detected at 0-10 sccm. However, at 20-30 sccm, only O2+ and hydrated proton clusters H3O+(H2O)n (n = 0-5) were observed, with H+(H2O)3 being dominant. Similar trends were observed with N2 addition. Interestingly, in mixed-gas conditions (He + N2 30 sccm + O2), hydrated clusters appeared only when O2 was 20 sccm. These findings offer insights into ion formation dynamics under APPJ conditions.