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Zusammenfassung:
The interaction of strong laser fields with matter intrinsically provides powerful tools to image transient dynamics with an extremely high spatiotemporal resolution. In strong-field physics, the initial conditions of this interaction are generally considered a weak perturbation. We investigated strong-field ionisation of laser-aligned molecules and showed, for the first time, that the initial momentum acquired by the photoelectron at birth has a dramatic impact on the overall strong-field dynamics: It sets the clock for the emission of electrons with a given kinetic energy. This result represents a new benchmark for the seminal statements of strong-field physics, highlighting the crucial importance of the initial electron-emission conditions. Our findings have strong impact on the interpretation of self-diffraction experiments, where the photoelectron momentum distribution is used to retrieve molecular structures. Furthermore, the resulting encoding of the time-energy relation in molecular-frame photoelectron distributions provides a new way of probing the molecular potential with sub-femtosecond resolution and accessing a deeper understanding of electron tunnelling.
