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In this paper, we report a molecular beam mass spectrometer study of a timemodulated 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. K E Y W O R D S absolute density, atomic oxygen, molecular beam mass spectrometer, ozone, plug flow model

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