Abstract
The FLASH XUV-free electron laser has been used to irradiate solid samples at intensities of the order 10 16 W cm −2 at a wavelength of 13.5 nm. The subsequent time integrated XUV emission was observed with a grating spectrometer. The electron temperature inferred from plasma line ratios was in the range 5–8 eV with electron density in the range 10 21–10 22 cm −3. These results are consistent with the saturation of absorption through bleaching of the L-edge by intense photo-absorption reported in an earlier publication.
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