Figure 2: Simulated emission spectra.
From: Investigation of femtosecond collisional ionization rates in a solid-density aluminium plasma
The three-dimensional (3D) simulated spectrum from the target sample, shown both resolved in time and time-integrated, is in excellent agreement with the experimental measurement, provided the higher collision rates are used (see text and Fig. 3). The Gaussian FEL pulse has a full-width at half-maximum of 80 fs and its peak is placed at t=0. In a, the system is shown to be pumped at 1,590 eV, for which lines IV and V can be pumped directly, while lines VI and above emit because of collisional processes. In b, the system is pumped at 1,630 eV and lines VII and above emit because of collisional ionization. The relatively weak feature just below 1,560 eV is Kβ emission.
