Absolute spatially and time‐resolved O, O 3 , and air densities in the effluent of a modulated RF‐driven atmospheric pressure plasma jet obtained by molecular beam mass spectrometry

In this paper, we report a molecular beam mass spectrometer study of a time‐modulated radiofrequency (RF)‐driven atmospheric pressure plasma jet in Ar + 1% O 2 . Time‐resolved measurements of the absolute density of O 3 during the RF modulation period revealed a temporal increase of O 3 densities at the start and end of the power modulation. This increase correlates with the increase in O 2 due to plasma‐induced transient vortices in the gas jet. Pseudo‐one‐dimensional plug flow modeling of the axial species densities as a function of distance match well with the experimentally recorded trends. The obtained results were used to assess the importance of the O flux in previously reported ClO − production in saline by the same plasma jet.