LIFETIME MEASUREMENTS OF SOME 2P(5)3P AND 2P(5)3D LEVELS IN NE-LIKE CRXV AND FEXVII

Experimental lifetimes of two 2p(5)3p and two 2p(5)3d levels of neonli ke CrXV and FeXVII have been obtained using the beam-foil technique. D ecay curves of the 3s-3p transitions were analyzed by the ANDC (Arbitr ary Normalized Decay Curve) method taking into account cascading trans itions from the 3d levels. Those of the 3p-3d transition were done by multi-exponential fitting. The lifetimes obtained in ns for the 3d(3)F (3) and 3d(3)F(4) levels are 0.136 and 0.117 for CrXV and 0.083 and 0. 097 for FeXVII, and those of 3p(3)D(2) and 3p(3)D(3) are 0.208 and 0.1 71 for CrXV and 0.176 and 0.173 for FeXVII, respectively. The results are compared with theoretical values and the CrXV results are also com pared with previous experimental work. Recent theoretical values agree well with the experimental values presented here.