Decay of cystalline order and equilibration during the solid-to-plasma transition induced by 20-fs microfocused 92-eV free-electron-laser pulses.
2011
We have studied a solid-to-plasma transition by irradiating Al foils with the FLASH
free electron laserat intensities up to 1016 W/cm2. Intense XUV self-emission shows spectral features that are consistent with emission from regions of high density, which go beyond single inner-shell photoionization of solids. Characteristic features of intrashell transitions allowed us to identify
Augerheating of the electrons in the
conduction bandoccurring immediately after the absorption of the XUV laser energy as the dominant mechanism. A simple model of a multicharge state inverse
Auger effectis proposed to explain the target emission when the
conduction bandat solid density becomes more atomiclike as energy is transferred from the electrons to the ions. This allows one to determine, independent of plasma simulations, the electron temperature and density just after the decay of crystalline order and to characterize the early time evolution.
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