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Poster Presentations
Day 2, June 23（Mon.）
Room P (Maesato East, Foyer, Ocean Wing)
- 2P-PM-14
Effects of Additional Gases on the Ions Generated by Atmospheric Pressure Plasmas
(1NIT, Kochi Col., 2Toyohashi Tech.)
oKokone Michikura1, Kenkichi Nagato1, Hirofumi Kurita2
Atmospheric pressure plasmas generate reactive oxygen and nitrogen species (RONS) which are important for medical and agricultural applications. This study investigated the influence of the additional gases (N2/O2) on the ion composition generated by atmospheric pressure helium plasmas using atmospheric pressure ionization mass spectrometry (API-MS). Significant differences in negative ion composition were observed under three different experimental conditions (adding only nitrogen, only oxygen, or both gases). With nitrogen addition alone, O- ions dominated while O3-proportionally increased with nitrogen flow rate. NO3- appeared only at high nitrogen flow rate (30 sccm). Using oxygen as an additional gas, oxygen-based ions (O-, O2-, O3-) were detected as major ions, with O3- reaching approximately 80% at 30 sccm. Interestingly, oxygen addition produced more NO3- than nitrogen addition. In experiments when both gases were added simultaneously, NO3- significantly increased. NO3- and O3- each constituting about half of total ions at oxygen flow rates of 10-30 sccm.
The results demonstrate that oxygen is necessary for producing reactive nitrogen species, and that the combined addition of both gases enhances the production of reactive nitrogen species.