Photoionized xenon cluster plasmas generated by a soft x-ray laser pulse

The xenon clusters were irradiated with a soft x-ray laser pulse having a wavelength of 13.9 nm (hv = 89.2 eV) and intensity of up to 2×1010W/cm2 for the first time. The photon energy was high enough to photoionize inner-shell electrons (4d) of the Xe atom. In contrast to the results obtained in synchrotron radiation experiments, the enhancement of double Auger decay probability with increasing cluster size and x-ray laser intensity was observed.