A5034089551- Laser-Matter Interactions and Applications
- Advanced Fiber Laser Technologies
- Advanced Chemical Physics Studies
- Atomic and Molecular Physics
- Spectroscopy and Quantum Chemical Studies
- Mass Spectrometry Techniques and Applications
- Laser-Plasma Interactions and Diagnostics
- Advanced X-ray Imaging Techniques
- Spectroscopy and Laser Applications
- Quantum, superfluid, helium dynamics
- Laser Material Processing Techniques
- Terahertz technology and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Cold Atom Physics and Bose-Einstein Condensates
- Laser Design and Applications
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Atomic and Subatomic Physics Research
- Solid State Laser Technologies
- Perovskite Materials and Applications
- nanoparticles nucleation surface interactions
- Adaptive optics and wavefront sensing
- Graphene research and applications
- Particle accelerators and beam dynamics
- Advanced optical system design
Istituto di Fotonica e Nanotecnologie
2015-2025
Center for Biomolecular Nanotechnologies
2014-2024
National Research Council
2011-2024
University of Milan
2008-2020
Politecnico di Milano
2011-2018
Mylan (Switzerland)
2016-2017
Istituto Nazionale di Documentazione Innovazione e Ricerca Educativa
2014
Elettra-Sincrotrone Trieste S.C.p.A.
2013-2014
IBM (India)
2013
École Polytechnique Fédérale de Lausanne
2013
This review presents the technological infrastructure that will be available at Extreme Light Infrastructure Attosecond Pulse Source (ELI-ALPS) international facility. ELI-ALPS offer to scientific community ultrashort pulses in femtosecond and attosecond domain for time-resolved investigations with unprecedented levels of high quality characteristics. The laser sources beamlines facility make technology accessible scientists lacking access these novel tools. Time-resolved investigation...
Ab initio calculations within density-functional theory combined with experimental Raman spectra on cluster-beam deposited pure-carbon films provide a consistent picture of $sp$-carbon chains stabilized by $s{p}^{3}$ or $s{p}^{2}$ terminations, the latter being sensitive to torsional strain. This unexplored effect promises many exciting applications since it allows one modify conductive states near Fermi level and switch off on-chain $\ensuremath{\pi}$-electron magnetism.
The low density matter end-station at the new seeded free electron laser FERMI@Elettra is a versatile instrument for study of atoms, molecules and clusters by means ion spectroscopies. Beams helium droplets as well metals can be produced three different pulsed valves. atomic molecular beams may seeded, pure, or doped with other atoms molecules. electrons ions ionization fragmentation samples intense light FERMI analysed available spectrometers, to give mass spectra energy angular...
Pulses of x-ray light that last mere attoseconds are essential to capturing fundamental processes in nature, such as the motion electrons and their role chemical bonding. New experiments generate and, for first time, characterize attosecond pulses soft-x-ray portion spectrum.
The ionization dynamics of He nanodroplets irradiated with intense femtosecond extreme ultraviolet pulses up to 1013 W/cm2 power density have been investigated by photoelectron spectroscopy. Helium droplets were resonantly excited atomiclike 2p states a photon energy 21.4 eV, below the potential (Ip), and directly into continuum 42.8 eV photons. While electron emission following direct above Ip is well explained within model based on sequence events, resonant excitation provides evidence...
Intense, circularly polarized extreme-ultraviolet and near-infrared (NIR) laser pulses are combined to double ionize atomic helium via the oriented intermediate He^{+}(3p) resonance state. Applying angle-resolved electron spectroscopy, we find a large photon helicity dependence of spectrum angular distribution electrons ejected from by NIR multiphoton absorption. The measured circular dichroism is unexpectedly found vary strongly as function intensity. experimental data well described...
We investigated the giant resonance in xenon by high-order harmonic generation spectroscopy driven a two-color field. The addition of nonperturbative second component parallel to driving field breaks symmetry between neighboring subcycles resulting appearance spectral caustics at two distinct cutoff energies. By controlling phase delay color components it is possible tailor emission order amplify and isolate feature interest. In this Letter we demonstrate how control scheme can be used...
Free electron lasers (FELs) offer the unprecedented capability to study reaction dynamics and image structure of complex systems. When multiple photons are absorbed in systems, a plasma-like state is formed where many atoms ionized on femtosecond timescale. If multiphoton absorption resonantly-enhanced, system becomes electronically-excited prior plasma formation, with subsequent decay paths which have been scarcely investigated date. Here, we show using helium nanodroplets as an example...
High harmonic generation (HHG) spectroscopy has opened up a new frontier in ultrafast science, where electronic dynamics can be measured on an attosecond time scale. The strong laser field that triggers the high response also opens multiple quantum pathways for multielectron molecules, resulting complex process of rearrangement during ionization. Using combined experimental and theoretical approaches, we show how multi-dimensional HHG used to detect follow core sub-laser cycle scales. We...
The Low Density Matter (LDM) beamline has been built as part of the FERMI free-electron laser (FEL) facility to serve atomic, molecular and cluster physics community. After commissioning phase, it received first external users at end 2012. design characterization LDM photon transport system is described, detailing optical components beamline.
Over the last few decades, investigation of ultrafast phenomena occurring in atoms, molecules and solid-state systems under a strong-field regime light-matter interaction has attracted great attention. The increasing request for suitable optical technology is significantly boosting development powerful laser sources. In this framework, Optical Parametric Amplification (OPA) currently becoming leading solution applications high-power ultra-broadband light burst generation. main advantage...
Chiral molecules are widespread in nature, playing a fundamental role bio-chemical processes and the origin of life itself. The observation dynamics chiral is crucial for understanding control activity photo-excited states. One most promising techniques study systems time-resolved photoelectron circular dichroism (TR-PECD), which offers an intense sensitive probe vibronic geometric molecular structure as well electronic structures, their evolution on femtosecond timescale. However, non-local...
Ultrafast time-resolved photoelectron spectra are reported for the vacuum-ultraviolet (VUV) photoionization of acetylene following excitation to Ã1Au state via UV absorption at 200 nm. The energy lies above lowest dissociation threshold C2H X̃2Σ+ + H, as well adiabatic form (Ã2Π) H. time-dependent mass and provide insight into intramolecular decay processes state. In addition, with VUV light access both X̃2Πu Ã2Σg+ states ion, predicted, but previously unobserved, 1 2Πg state, which...
Helium nanodroplets are widely used as a cold, weakly interacting matrix for spectroscopy of embedded species. In this work, we excite or ionize doped He droplets using synchrotron radiation and study the effect onto dopant atoms depending on their location inside (rare gases) outside at droplet surface (alkali metals). Using photoelectron-photoion coincidence imaging variable photon energies (20–25 eV), compare rates charge-transfer to Penning ionization dopants in two cases. The surprising...
The ionization dynamics of pure He nanodroplets irradiated by Extreme ultraviolet radiation is studied using Velocity-Map Imaging PhotoElectron-PhotoIon COincidence spectroscopy. We present photoelectron energy spectra and angular distributions measured in coincidence with the most abundant ions He(+), He2(+), He3(+). Surprisingly, below autoionization threshold droplets, we find indications for multiple excitation subsequent droplets a Penning-like process. At high photon energies observe...
The relaxation of photoexcited nanosystems is a fundamental process light-matter interaction. Depending on the couplings internal degrees freedom, can be ultrafast, converting electronic energy in few fs, or slow, if trapped metastable state that decouples from its environment. Here, helium nanodroplets are resonantly excited by femtosecond extreme-ultraviolet (XUV) pulses seeded free-electron laser. Despite their superfluid nature, we find lowest electronically states undergo ultrafast...
The ultrafast structural dynamics of water following inner-shell ionization is a crucial issue in high-energy radiation chemistry. We have exposed isolated molecules to short x-ray pulse from free-electron laser and detected momenta all produced ions coincidence. By combining experimental results theoretical modeling, we can image dissociation individual unprecedented detail. reveal significant molecular H2O2+, such as asymmetric deformation bond-angle opening, leading two-body or three-body...
We provide experimental evidence for interatomic Coulombic decay (ICD) in mixed rare gas dimers following resonant Auger decay. A velocity map imaging apparatus together with a cooled supersonic beam containing Ar2 and NeAr was used to record the energy angular distributions of electrons coincidence two mass selected ions excitation number resonances converging Ar 2p3/2–1 threshold using synchrotron radiation. It is shown that ICD process can be controlled by choice partner atom dimer or...
The hitherto unexplored two-photon doubly excited states [Ne^{*}(2p^{-1}3s)]_{2} were experimentally identified using the seeded, fully coherent, intense extreme ultraviolet free-electron laser FERMI. These undergo ultrafast interatomic Coulombic decay (ICD), which predominantly produces singly ionized dimers. In order to obtain rate of ICD, resulting yield Ne_{2}^{+} ions was recorded as a function delay between pump and UV probe pulses. extracted lifetimes long-lived states, 390(-130/+450)...
Interatomic Coulombic decay (ICD) is induced in helium (He) nanodroplets by photoexciting the n=2 excited state of He^+ using XUV synchrotron radiation. By recording multiple coincidence electron and ion images we find that ICD occurs various locations at droplet surface, inside surface region, or interior. gives rise to energetic ions as previously observed for free He dimers. deeper leads ejection slow due Coulomb explosion delayed elastic collisions with neighboring atoms, formation...
The valence and core-level photoelectron spectra of gaseous indole, 2,3-dihydro-7-azaindole, 3-formylindole have been investigated using VUV soft X-ray radiation supported by both an ab initio electron propagator density functional theory calculations. Three methods were used to calculate the outer band photoemission spectra: Green function, partial third order, renormalized order. While all gave acceptable description spectra, last method yielded very accurate agreement, especially for...
Abstract We generate attosecond pulse train (APT) in argon driven by the high repetition rate (HR) laser of extreme light infrastructure-attosecond source (ELI-ALPS), providing 100 kHz, 80 W, 1030 nm, 40 fs pulses from a fiber chirped-pulse amplification (fiber-CPA) system. Under current operating conditions harmonic generation beamline (HR-GHHG), we observed average duration to be 395 as measured using technique reconstruction beating interference two-photon transitions. The uses an...
Seeded free electron lasers theoretically have the intensity, tunability, and resolution required for multiphoton spectroscopy of atomic molecular species. Using seeded laser FERMI a novel detection scheme, we revealed two-photon excitation spectra dipole-forbidden doubly excited states in helium. The spectral profiles lowest $(\ensuremath{-}1,0{)}^{+1}$ $^{1}{S}^{e}$ $(0,1{)}^{0}$ $^{1}{D}^{e}$ resonances display energy shifts meV range that depend on pulse intensity. results are explained...