Ultrafast Dynamics Driven by Intense Light Pulses

Author:Markus Kitzler & Stefanie Gräfe
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

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Fig. 8.5Photon-diagrams for laser-assisted photoionization. Single XUV-photon absorption contributes with a direct path (d) to the final state. The dominant two-photon processes involve the absorption or emission of a laser photon indicated by paths (a) and (e). Higher-order processes involve the exchange of more laser photons. Figure adapted from [35]

corresponding to absorption (a) and emission (e) of a laser photon from the fields as depicted in Fig. 8.5. Note that the intermediate XUV photon energy is different in the two paths to ensure global energy conservation. For this class of multiphoton processes numerically exact computations can only be performed in one-electron (hydrogen-like) and two-electron (helium-like) systems. In single-ionization events the wave packet can be described as a single excited electron at a large radial distance far from the ionic core. Within the single-active electron approximation, it is feasible to derive a convenient approximation method designed to evaluate the time delay induced by the IR-driven transition in the continuum. It has been demonstrated that the main results from this analysis also hold for the delay in photoionization from many-electron atomic systems [37, 46].

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