Abstract
Storage Ring Free Electron Laser (SRFEL or FEL) has been developed as a powerful light source owing to its high power, high coherence and unique temporal feature. At UVSOR, we have carried out the two-photon double-resonant excitation on Xe atoms, utilizing a SR pulse as a pump and an FEL pulse as a probe light. In the first experiment, the two-photon double-resonant excitation of the Xe * 5p 5 nf autoionization states using the combination of FEL around 570 nm and the undulator radiation have been demonstrated. We are also carrying similar experiments in the shorter wavelength region (around 400 nm) of FEL, where higher Rydberg series of the Xe * 5p 5 nf states via the Xe * 5p 5 5d intermediate state are accessible. PACS codes: 41.60. Cr; 41.60Ap; 33.80. Rv
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