The spatiotemporal structure of O2 rf discharges between parallel plates at 13.56 MHz is investigated by using the relaxation continuum model. The results for pressure of 0.5 Torr and the sustaining voltage of 75-200 sin ωt V are studied by considering the elementary particles, O +2, O+, O-2, O -, electrons, and O in O2. In these conditions, atomic oxygen, formed by the dissociative electron impact in O2 with density of ∼1014 cm-3, plays important role to the rf structure through the associative detachment process. That is, the expanding characteristics of the sheath width unique to the O2 rf discharge are realized with increasing the sustaining voltage. The validity of the numerical result is demonstrated with the spatiotemporal structure by the measurement by the spatiotemporally resolved optical emission spectroscopy. The flux of each particle to the electrode is also discussed.
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