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Chapter and Conference Paper
Bright Coherent XUV Generation in Microfluidic Glass Devices for Ultrafast X-ray Spectroscopy
Ultrafast X-ray spectroscopy allows studying light-matter interaction with an unprecedented temporal resolution, with the further advantage of being element-selective and oxidation- and spin-state specific. He...
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Article
Open AccessUltrafast relaxation of photoexcited superfluid He nanodroplets
The relaxation of photoexcited nanosystems is a fundamental process of light–matter interaction. Depending on the couplings of the internal degrees of freedom, relaxation can be ultrafast, converting electroni...
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Chapter and Conference Paper
Disentangling Structural and Dynamical Effects via Multidimensional High Harmonic Spectroscopy
Extending the dimensionality of high harmonic generation (HHG) measurements has the potential to reconstruct structural features in molecules and resolve multielectron dynamics on attosecond time scales. We de...
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Chapter and Conference Paper
Probing Xenon Electronic Structure by Two-Color Driven High-Order Harmonic Generation
We studied the two-color HHG emission from xenon in the giant resonance spectral region. We found a substantial departure from the behavior expected for the single-active-electron picture which could be ascrib...
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Article
Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism
Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. ...
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Article
Open AccessCollective Autoionization in Multiply-Excited Systems: A novel ionization process observed in Helium Nanodroplets
Free electron lasers (FELs) offer the unprecedented capability to study reaction dynamics and image the structure of complex systems. When multiple photons are absorbed in complex systems, a plasma-like state ...
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Article
Full tunability of laser femtosecond high-order harmonics in the ultraviolet spectral range
We demonstrate experimentally the full tunability of a coherent femtosecond source in the whole ultraviolet spectral region. The experiment relies on the technique of high-order harmonic generation driven by a...
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Article
Optimization of low-order harmonic generation by exploitation of a resistive deformable mirror
The generation of harmonics from the interaction of an ultra-intense laser pulse and a gas jet is strongly influenced by the intensity and shape of the laser beam. In this work we present a sensor-less optimiz...
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Article
Probing the chemical reactivity of free titanium clusters by x-ray absorption spectroscopy
Synchrotron radiation-based experimental techniques are largely employed for the characterization of the reactivity of finite size systems; in particular, x-ray absorption spectroscopy (XAS) is a suitable tool...
