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Figure 1

From: Optical and spectroscopic study of a supersonic flowing helium plasma: energy transport in the afterglow

Figure 1

Optical Emission Spectroscopy of the He plasma: the graph shows the typical overall emission spectrum of the supersonic helium jet with a density of 3.9 × 1018 cm−3 (see Methods and Supplementary Information) when interacting with the carbon ion beam. The assignment of the main lines is reported on the right side, with the most intense lines highlighted in bold.

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