Abstract
We have unveiled coherent multiphoton interferences originating from different quantum paths taken by the Auger electron induced by a high-intensity x-ray/extreme ultraviolet pulse under the presence of a strong optical field. These interferences give rise to a clear signature in the angle-resolved Auger electron spectrum: an asymmetry with respect to the energy of the Auger decay channel. In order to illustrate this effect we have considered the resonant Auger decay of the transition in Ne+. The simulations show that these interferences are very sensitive to the parameters of the x-ray and optical fields.
Highlights
Free-electron lasers (FELs) can achieve very high intensities, an important feature to produce nonlinear processes in the x-ray/XUV regime [1]
The sidebands are related to the above-threshold ionization (ATI) phenomenon [30], and analogously to ATI, every sideband-peak is separated by an optical photon energy
The main goal of this work is to unveil the origin and the main effects of the coherent multiphoton interferences described in the last section, we would like to provide a discussion of some factors that may play an important role for the observation of the asymmetries in the Auger electron spectrum
Summary
Free-electron lasers (FELs) can achieve very high intensities (more than 1015 W/cm2), an important feature to produce nonlinear processes in the x-ray/XUV regime [1]. The combination of x-ray/XUV light with strong optical fields (1010-1015W/cm2) introduces a new degree of controllability exceptionally beneficial for pump-probe experiments [17,18,19], optical control of x-ray absorption [20, 21], and x-ray pulse characterization [22]. In these experiments inner-shell holes are created and the Auger decay that follows provides an ultrafast internal probe of the electron dynamics. Our simulations show that these interferences are very sensitive to the x-ray and optical parameters due to the intrinsic coherence of the whole process
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