COFFEE · Condensed-phase Optical-Femtosecond-Fringe-Encoded EUV Diffraction

Condensed-phase Optical-Femtosecond-Fringe-Encoded EUV Diffraction

Femtosecond and attosecond pulses in the extreme UV (EUV) spectral range are produced via the process of high-order harmonic generation (HHG). Because of the spatial and temporal coherence of such EUV sources, they are highly suitable for probing inner-shell transitions in atoms and molecules and play an indispensable role in time-resolving dynamics triggered by such electronic transitions. The current status of attosecond spectroscopy parallels the development in the field of femtochemistry two decades earlier, with a variety of multi-beam and multi-pulse techniques, familiar from femtochemistry, now being adapted for the use with EUV probe or excitation. The aim of the project was to perform a recently developed technique of Attosecond Transient Absorption Spectroscopy on a model gas – neutral krypton, which was not studied before. Such an achievement would pave the way for applying the technique on a thin layer of solid krypton, ultimately enhancing the experimental yield with the femtosecond Transient Grating technique. Those results would be of high importance for studying thin layers of condensed matter and surfaces – the topic so important for e.g. biology of membranes or surface physics.

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