Abstract
In the present work, time-, space- and species-resolved optical emission spectroscopy has been applied to investigate post-pulse behavior of the reactive High Power Impulse Magnetron Sputtering (HiPIMS) process with a partially poisoned target. Following each pulse, at a high O2/Ar ratio, a well-defined post-discharge emission zone detaches from the target during the first few microseconds of the electron cool-down; this zone exhibits high emission intensity in the near-surface region, and it moves toward the substrate holder. We link this behavior to a localized high density of metastable molecular oxygen, and to the electron attachment dissociation of oxygen.
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