Reactive oxygen and nitrogen species (RONS) are desired in numerous applications from the destruction of harmful proteins and bacteria for sterilization in the medical field to taking advantage of the metastable characteristics of O2(1 Δ) to transfer energy to other species. Advances in atmospheric pressure plasma jets in recent years have shown the possibility of using this technology as a source of RONS. The plasma jets consist of small diameter tubes (a few mm) through which rare gas mixtures (e.g., He seeded with a few percent of O2) are flowed into room air. They are typically operated in a dielectric barrier discharge (DBD) configuration which produces an ionization wave (or plasma bullet) with repetition rates of many kHz to tens or hundreds of MHz.