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Beam-foil spectra of chlorine and oxygen ions at beam energies of 6-42 M e V .

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The experimental setup has been thoroughly described in [7]. The main difference is that now the radiation from the decaying levels was observed using a l m vacuum monochromator Of the Seya-"ioka type, designed and built at the The transitions ls2s 'S,-ls2p 'P2 and ls2s 'Ss,-ls2p 'Po in He-like AI have been observed in a beam-foil experiment at 900 f 1 A and 953 i: 1 A, respectively. The lifetimes of the upper levels have been determined to 5.4 i: 0.2 ns ('P2) and 4.8 i: 0.211s ("io). We have observed a shortening of the 2p 'Po lifetime in agreement with theories which consider hyperfine quenching effects, and we &'e an estimate of the quenching of the level. The wavelengths are compared with theoretical values which include Lamb shift.Uppsala Laboratory. The photons were detected with a Bendix channeltron.Step motors were used to move the grating and to translate the foil, each step corresponding to a preset vdue of integrated beam current, collected in a Faraday cup behind the foil. Typical beam currents were 200-300 nA at the 20pg cm-'

Lifetime measurements for some An = 0 transitions in C l X I I I -d XV.