Abstract
A grazing-incidence spectrometer for the wavelength range λ≦13 nm has been built and tested with foil-excited fast oxygen ions. The new apparatus has been used to study the variation of the 2s 3p3P10 level lifetime in the Be isoelectronic sequence by observation of the intercombination decay to the 2s21S0 ground state. The experimental problems are described. The results agree with only some of the theoretical predictions.
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