Autoionization…                                 Lorentzian shape
Time profile:
Field-free:
Energy domain:
Laser-assisted: electron spectrum under strong field approximation (SFA):
Virtual three-step process:
1. Resonance state excited by X-ray at time t1;
2. Decay at time t2 giving birth to continuum electrons;
3. Propagation of electrons in the laser field.
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