Abstract
The backward secondary electron emission yields of MeV ions (H+, He+, He++, Cl, Si, and Cu) impinging on thick carbon and gold targets are studied. The measured results for H+ (1 MeV ⩽ E ⩽ 5 MeV) on carbon are proportional to the electronic stopping power. Our experimental data and fitting formula of yields for H+ (1 MeV ⩽ E ⩽ 4.5 MeV) impacting Au are compared with the theoretical expectation. The influence of the collective field and the charge state of ions on the secondary electron emission yield is discussed.
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