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The delayed fluorescence of the soft X-ray (ls-2p) transition was observed for H-like ions (O 7+ and F 8+) between 1.3ns and 20ns decay time after beam-foil excitation. The delayed X-ray fluorescence was found to decay with a t -a power law time dependence. The non-exponential decay is attributed to cascading through higher lying states. We found that Ao=1.40+_0.08 and AF=1.44_+0.02 for H-like oxygen and fluorine, respectively. Present results are in fair agreement with the previously reported exponent, A o = 1.5, measured over 3 ns after excitation.

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