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The experimental scheme of the microwave-generated copper plasma (right) and the plasma column ejected from the copper emitter to the collector in the microwave cavity (left).
The optical spectrum of the copper plasma column. The inset shows the spectrum of the plasma column in the near-UV range.
Typical SAXS intensity from the fire column and their analysis in terms of USF vs the scattering vector . The particle size distribution within the copper fire column, computed by inverse Fourier transform, is shown in the inset (with peaks at 27, 65, and 110 nm).
Sea-urchin-like copper clusters and their circular arrangement observed on the collector surface ex situ by an ESEM.
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