Experimental transition probabilities of intercombination transitions in Mg-like and Al-like ions of bromine.

Time-resolved extreme ultraviolet spectra of foil-excited 120-MeV Br ions have been recorded, using a spectrometer equipped with a position-sensitive detector. The spectra near \ensuremath{\lambda}=20\char21{}30 nm were measured at times after excitation of up to 6 ns. Prominent in the delayed spectra were the long-lived decays of the intercombination transitions in the Mg-like ${\mathrm{Br}}^{23+}$ and Al-like ${\mathrm{Br}}^{22+}$ ions. The present paper reports on lifetime measurements for intercombination transitions in highly charged bromine ions using such a position-sensitive detector.