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18 September 2007 Some 10-fs x-ray emission switches
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The transient evolution of X-ray emission from high density plasmas usually terminates with a recombination regime at low density. For matter irradiated by short pulses (< 1 ps) the accumulation of x-ray emission at low density cannot be suppressed by streak camera techniques as current time resolution is limited (> 0.5 ps). We propose intrinsically fast x-ray signals realized by the radiation emission from hollow ion states K0Ln to temporally isolate high density information from the low density radiative recombination regime. Simulations carried out for short pulse (100 fs) intense x-ray free electron laser radiation (XFEL) interacting with dense plasmas demonstrate that the hollow ion x-ray emission "switch" has a time scale faster than 50 fs. Moreover, the time of the hollow-ion emission signal is related to the interaction time and is thus directly related only to the highest density regimes even if the usual time integrated spectroscopic techniques are employed.
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F. B. Rosmej, R. W. Lee, D. H. G. Schneider, and H.-K. Chung "Some 10-fs x-ray emission switches", Proc. SPIE 6703, Ultrafast X-Ray Sources and Detectors, 670302 (18 September 2007);

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