Schematic of the experimental setup. The inset is a top view of the MSRR.
Emission light cone from the microplasma collected by the objective mirror.
Discharge pattern of the microplasma. The horizontal white lines denote the two edges of the gap in the MSRR.
Intensity distributions of light emissions. (a) Normalized intensity of 415.8 nm emission. (b) Normalized intensity of 750.4 nm emission.
Spatial distribution of the time-averaged effective electron temperature. (a) Contours of the time-averaged effective electron temperature distribution. (b) Time-averaged effective electron temperature along the vertical black line in (a).
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