Outer 2s-Shell Electron Excitation Emission from C-, N- and O-Impurity Ions in Linear Z-Pinch He Plasma

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Emission from C-, N- and O-impurity ions in linear z-pinch He plasma was measured in λ 1500–500 Å region. The experimental results suggest that the emission of the transitions 2s2p^m–2s²2p^m−1 in impurity ions X_z+1 is induced by the charge exchange process, He⁺(1s)+X_z(2s²2p^m)→He(1s²)+X_z+1^* (2s2p^m), and that this process leads to the population inversion in X_z+1 ions.