Lorenzo Raimondi
A5065369164- Advanced X-ray Imaging Techniques
- Particle Accelerators and Free-Electron Lasers
- Advanced Electron Microscopy Techniques and Applications
- Particle accelerators and beam dynamics
- Laser-Plasma Interactions and Diagnostics
- Laser-Matter Interactions and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
- Surface Roughness and Optical Measurements
- Advanced Measurement and Metrology Techniques
- Adaptive optics and wavefront sensing
- Advanced Surface Polishing Techniques
- Magnetic properties of thin films
- Crystallography and Radiation Phenomena
- Optical Systems and Laser Technology
- Spectroscopy and Quantum Chemical Studies
- Diamond and Carbon-based Materials Research
- Magnetic Properties and Applications
- Advanced Semiconductor Detectors and Materials
- Astrophysical Phenomena and Observations
- Advanced X-ray and CT Imaging
- Scientific Measurement and Uncertainty Evaluation
- Mass Spectrometry Techniques and Applications
- Advancements in Photolithography Techniques
- Astronomy and Astrophysical Research
Elettra-Sincrotrone Trieste S.C.p.A.
2016-2025
Fritz Haber Institute of the Max Planck Society
2022
Fermi National Accelerator Laboratory
2019
Brera Astronomical Observatory
2010-2017
University of Siegen
2017
Singulus (Germany)
2017
University of Insubria
2010-2011
Goddard Space Flight Center
2009
National Institute for Astrophysics
2009
University of Bologna
2009
Exploring the dynamics of matter driven to extreme non-equilibrium states by an intense ultrashort X-ray pulse is becoming reality, thanks advent free-electron laser technology that allows development different schemes for probing response at variable time delay with a second pulse. Here we report generation two-colour ultraviolet pulses controlled wavelengths, intensity and timing seeding high-gain harmonic multiple independent pulses. The potential this new scheme demonstrated evolution...
FERMI is a seeded free-electron laser (FEL) facility located at the Elettra laboratory in Trieste, Italy, and now user operation with its first FEL line, FEL-1, covering wavelength range between 100 20 nm. The second FEL-2, high-gain harmonic generation double-stage cascade 20-4 nm, has also completed commissioning call been recently opened. An overview of typical operating modes presented.
The FERMI facility in Trieste, Italy, is ideal for generating and measuring light characterized by tunable polarization states the vacuum ultraviolet spectral range. New results reveal a high degree of (>0.9) over 26--55 nanometers.
Advances in developing ultrafast coherent sources operating at extreme ultraviolet (EUV) and x-ray wavelengths allow the extension of nonlinear optical techniques to shorter wavelengths. Here, we describe EUV transient grating spectroscopy, which two crossed femtosecond pulses produce spatially periodic nanoscale excitations sample their dynamics is probed via diffraction a third time-delayed pulse. The use radiation with down 13.3 nm allowed us gratings periods as short 28 observe thermal...
FERMI@Elettra is a free electron-laser (FEL)-based user facility that, after two years of commissioning, started preliminary users' dedicated runs in 2011. At variance with other FEL facilities, has been designed to deliver improved spectral stability and longitudinal coherence. The adopted scheme, which uses an external laser initiate the process, demonstrated be capable generating pulses close Fourier transform limit. We report on first instance wavelength tuning, both narrow large range...
FERMI@Elettra, the first vacuum ultraviolet and soft X-ray free-electron laser (FEL) using by default a "seeded" scheme, became operational in 2011 has been opened to users since December 2012. The parameters of seeded FERMI FEL pulses and, particular, superior control emitted radiation terms spectral purity stability meet stringent requirements for single-shot resonant coherent diffraction imaging (CDI) experiments. advantages intense with variable polarization have demonstrated experiments...
Abstract The advent of free-electron laser (FEL) sources delivering two synchronized pulses different wavelengths (or colours) has made available a whole range novel pump–probe experiments. This communication describes major step forward using new configuration the FERMI FEL-seeded source to deliver with wavelengths, each tunable independently over broad spectral adjustable time delay. FEL scheme makes use seed beams and split radiator section generate extreme ultraviolet from distinct...
FERMI is a novel class of free-electron laser that capable producing femtosecond pulses ultraviolet and x-ray light, essential to studying ultrafast processes in matter. A new investigation characterizes FERMI's pulse shape confirms it routinely generates Gaussian lasting few tens femtoseconds.
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...
The imaging sharpness of an X-ray telescope is chiefly determined by the optical quality its focusing optics, which in turn mostly depends on shape accuracy and surface finishing grazing-incidence mirrors that compose modules. To ensure performance during mirror manufacturing, a fundamental step predicting point spread function (PSF) from metrology surface. Traditionally, PSF computation X-rays assumed to be different depending whether defects are classified as figure errors or roughness....
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.
Abstract Roaming reactions involving a neutral fragment of molecule that transiently wanders around another before forming new bond are intriguing and peculiar pathways for molecular rearrangement. Such can occur example upon double ionization small organic molecules, have recently sparked much scientific interest. We studied the dynamics $$\hbox {H}_2$$ -roaming reaction leading to formation {H}_3^+$$ after two-photon ethanol 2-aminoethanol, using an XUV-UV pump-probe scheme. For ethanol,...
We present the experimental demonstration of a method for generating two spectrally and temporally separated pulses by an externally seeded, single-pass free-electron laser operating in extreme-ultraviolet spectral range. Our results, collected on FERMI@Elettra facility confirmed numerical simulations, demonstrate possibility controlling both temporal features generated pulses. A operated this mode becomes suitable light source jitter-free, two-colour pump-probe experiments.
Abstract Chirped pulse amplification in optical lasers is a revolutionary technique, which allows the generation of extremely powerful femtosecond pulses infrared and visible spectral ranges. Such are nowadays an indispensable tool for myriad applications, both fundamental applied research. In recent years, strong need emerged light sources producing ultra-short intense laser-like X-ray pulses, to be used experiments variety disciplines, ranging from physics chemistry biology material...
Abstract Short wavelength free-electron lasers (FELs), providing pulses of ultrahigh photon intensity, have revolutionized spectroscopy on ionic targets. Their exceptional flux enables multiple absorptions within a single femtosecond pulse, which in turn allows for deep insights into the photoionization process itself as well evolving states target. Here we employ ultraintense from FEL FERMI to spectroscopically investigate sequential emission electrons gaseous, atomic argon neutral ground...
The extension of nonlinear optical techniques to the extreme-ultraviolet (EUV), soft and hard x-ray regime represents one open challenges modern science since it would combine chemical specificity with background-free detection ultrafast time resolution. We report on first observation a four-wave-mixing (FWM) response from solid-state samples stimulated exclusively by EUV pulses. all-EUV FWM signal was generated diffraction high-order harmonics FERMI free-electron laser (FEL) standing wave...
The Elastic and Inelastic Scattering (EIS) beamline at the free-electron laser FERMI is presented. It consists of two separate end-stations: EIS-TIMEX, dedicated to ultrafast time-resolved studies matter under extreme metastable conditions, EIS-TIMER, spectroscopy mesoscopic dynamics in condensed matter. scientific objectives are discussed instrument layout illustrated, together with results from first exemplifying experiments.
The Diffraction and Projection Imaging (DiProI) beamline at FERMI, the Elettra free-electron laser (FEL), hosts a multi-purpose station that has been opened to users since end of 2012. This paper describes core capabilities station, designed make use unique features FERMI-FEL for performing wide range static dynamic scattering experiments. various schemes time-resolved experiments, employing both soft X-ray FEL seed IR radiation are presented by using selected recent results. ongoing upgrade...
The Photon Analysis Delivery and REduction System of FERMI (PADReS) has been routinely used during the machine commissioning operations since 2011. It also served needs several user runs at facility from late 2012. system is endowed with online shot-to-shot diagnostics giving information about intensity, spatial-angular distribution, spectral content, as well other to determine coherence, pulse length etc. Moreover, PADReS capable manipulating beam in terms intensity optical parameters....