2 research outputs found
Opacity effects in a solid-density aluminium plasma created by photo-excitation with an X-ray laser
The intensities within the focal spots of the output of recently developed X-ray sources based on freeelectron-
laser (FEL) technology are so great that atoms within the focal region can potentially absorb
several photons during the few tens of femtosecond X-ray pulse. Furthermore, the duration of the FEL Xray
pulse is comparable to the Auger decay times of inner-shell holes created by the X-rays themselves.
We report here how such a scenario can lead to opacity broadening of the fluorescence radiation emitted
by the hot, dense plasma, which is created as a result of the X-radiation focussed onto a solid target, and
in particular present calculations of the broadening of the Ka emission in a solid-density aluminium
target, produced when the FEL photon energy is tuned below the Al K-edge, but is resonant with the Ka
transition.
2014 Elsevier B.V. All rights reserved.111121sciescopu