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During the past decade, the generation of attosecond laser pulses enabled experimental studies of electron dynamics in atoms. In particular, the photoionization by XUV pulses in the presence of an additional strong low-frequency laser field has attracted much interest. Such a setup allows, for example, to extract timing information about the ionization process and to characterize the participating laser pulses. Here, we explore this photoionization if the plane-wave XUV pulse is replaced by a twisted X-wave that carries additional orbital angular momentum (OAM).

Sideband and streaking regimes in two-color photoionization by twisted X-waves in strong infrared fields