Abstract
The light pulses of mode-locked Ar + laser have been synchronized to the synchrotron radiation pulses of the SuperACO storage ring in Orsay. In order to test the feasibility and to demonstrate the capability for the investigation of free atoms we have studied the two-photon ionization of atomic Helium and Xenon via the He ∗ 1s3p and Xe ∗ 5p 55d resonant state, respectively. The experimental results show clearly an ionization signal which strongly depends on the temporal delay between the two light pulses. The spectra can be interpreted as the convolution of an exponential function representing the lifetime of the intermediate resonant state and a Gaussian function representing the cross correlation function of the synchrotron and laser radiation. The overall time resolution of the present set-up has been estimated to about 1 ns.
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