Abstract
The velocity dependences of the population of 2p and 4p states in fast (0.4–2 MeV) He + ion beams transmitted through a thin carbon foil have been measured. They are found to be quite different to each other. These results are analyzed in the framework of a simple model based on the possibility for a given excited state to be formed inside the solid. The conclusion is that in the studied velocity range the 2p state can exist in carbon whereas the 4p state cannot.
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