A5032230395- Advanced X-ray Imaging Techniques
- Advanced Electron Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Spectroscopy and Quantum Chemical Studies
- Laser-Plasma Interactions and Diagnostics
- Material Dynamics and Properties
- Laser-Matter Interactions and Applications
- High-pressure geophysics and materials
- X-ray Spectroscopy and Fluorescence Analysis
- Force Microscopy Techniques and Applications
- Phase Equilibria and Thermodynamics
- Particle accelerators and beam dynamics
- Photorefractive and Nonlinear Optics
- Mechanical and Optical Resonators
- Diamond and Carbon-based Materials Research
- Optical Coatings and Gratings
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Magnetic properties of thin films
- Gyrotron and Vacuum Electronics Research
- Magneto-Optical Properties and Applications
- Quantum, superfluid, helium dynamics
- Electron and X-Ray Spectroscopy Techniques
- Crystallography and Radiation Phenomena
- Thermal properties of materials
Elettra-Sincrotrone Trieste S.C.p.A.
2015-2024
Helmholtz-Zentrum Dresden-Rossendorf
2019
Max Planck Institute for the Structure and Dynamics of Matter
2019
Universität Hamburg
2019
AREA Science Park
2007-2015
University of Milan
2007
European Synchrotron Radiation Facility
2006-2007
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...
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...
X-ray free electron lasers (FEL) coupled with optical have opened unprecedented opportunities for studying ultrafast dynamics in matter.The major challenge pump-probe experiments using FEL and is synchronizing the arrival time of two pulses.Here we report a technique that benefits from seeded-FEL scheme uses seed laser nearly jitter-free experiments.Timing jitter as small 6 fs has been achieved confirmed by measurements FEL-induced transient reflectivity changes Si 3 N 4 both collinear...
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...
Collective lattice dynamics determine essential aspects of condensed matter, such as elastic and thermal properties. These exhibit strong dependence on the length-scale, reflecting marked wavevector excitations. The extreme ultraviolet transient grating (EUV TG) approach has demonstrated potential accessing a range corresponding to 10s nm representing spatial scale highest relevance for fundamental physics forefront technology, previously inaccessible by optical TG other inelastic scattering...
Joint inelastic neutron and x-ray scattering measurements have been performed on heavy water across the melting point. The spectra bear clear evidence of low- high-frequency shoulders related to transverse longitudinal modes, respectively. Upon increasing momentum transfer, spectral shape evolves from a viscoelastic regime, where low-frequency mode is clearly over-damped, toward an elastic one its propagation becomes instead allowed. crossover between two regimes occurs whenever both...
The recent construction of free electron lasers allows extending laboratory-based laser experiments to shorter wavelengths, accessing wavevectors typical nanoscale dynamics and adding element chemical state specificity by exploiting electronic transitions from core levels. high pulse energies available ensure that this new wavelength range can be advantageously used for nonlinear optics, as in the pioneering case transient grating spectroscopy: a time-resolved four-wave mixing technique...
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...
We utilize coherent femtosecond extreme ultraviolet (EUV) pulses derived from a free electron laser (FEL) to generate transient periodic magnetization patterns with periods as short 44 nm. Combining spatially excitation resonant probing at the dichroic M-edge of cobalt allows us create and probe gratings electronic magnetic excitations in CoGd alloy. In demagnetized sample, we observe an 50 fs rise time close FEL pulse duration ~0.5 ps decay within range for electron-phonon relaxation...
Ultrafast control of magnetization on the nanometer length scale, in particular all-optical switching, is key to putting ultrafast magnetism path toward future technological application data storage technology. However, manipulation with light this scale challenging due wavelength limitations optical radiation. Here, we excite transient magnetic gratings a GdFe alloy periodicity 87 nm by interference two coherent femtosecond pulses extreme ultraviolet spectral range. The subsequent evolution...
Abstract The absence of efficient light modulators for extreme ultraviolet (EUV) and X-ray photons considerably limits their real-life application, particularly when even slight complexity the beam patterns is required. Here we report on a novel approach to reversible imprinting holographic mask in an electronic Wigner crystal material with sub-90-nm feature size. structure imprinted sub-picosecond timescale using EUV laser pulses, acts as high-efficiency diffraction grating that deflects or...
Experimental characterization of the structural, electronic and dynamic properties dilute systems in aqueous solvents, such as nanoparticles, molecules proteins, are nowadays an open challenge. X-ray absorption spectroscopy (XAS) is probably one most established approaches to this aim it element-specific. However, typical interest often composed light elements that require extreme-ultraviolet soft photons. In spectral regime, water other solvents rather opaque, thus demanding radical...
Abstract We present an extreme ultraviolet (EUV) transient grating (TG) experiment of the spinel Co 3 O 4 compound using tuneable incident energies across M 2,3 -edge and a 395 nm probe pulse, detecting both first second diffraction orders (SDOs). While order shows monotonous behavior as function time, with sharp response at t = 0, followed by weak sub-picosecond component nearly constant signal thereafter, time dependence SDO varies dramatically energy it is tuned M-edge, appearance > 1...
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.
We investigate the excitation of coherent acoustic and optical phonons by ultrashort extreme ultraviolet (EUV) pulses produced a free electron laser. Two crossed femtosecond EUV (wavelength 12.7 nm) are used to excite at wavelength 280 nm, which detected via diffraction an probe beam. Longitudinal surface waves measured in BK-7 glass, diamond, Bi4Ge3O12; latter material, phonon mode is also observed. discuss probing different modes reflection transmission geometries frequency mixing bulk...
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...
Ultrafast optical-domain spectroscopies allow to monitor in real time the motion of nuclei molecules. Achieving element-selectivity had await advent resolved X-ray spectroscopy, which is now commonly carried at free electron lasers. However, detecting light element that are encountered organic molecules, remained elusive due need work under vacuum. Here, we present an impulsive stimulated Raman scattering (ISRS) pump/carbon K-edge absorption probe investigation, allowed observation...
Multi-dimensional spectroscopies with vacuum ultraviolet (VUV)/x-ray free-electron laser (FEL) sources would open up unique capabilities for dynamic studies of matter at the femtosecond–nanometer time–length scales. Using sequences ultrafast VUV/x-ray pulses tuned to electron transitions enables element-specific charge and energy flow between constituent atoms, which embody very essence chemistry condensed physics. A remarkable step forward towards this goal be achieved by extending four...
We report on new opportunities for ultrafast science thanks to the use of two-colour extreme ultraviolet (XUV) pulses at FERMI free electron laser (FEL) facility. The two have been employed carry out a pioneering FEL-pump/FEL-probe diffraction experiment using Ti target and tuning FEL M<sub>2/3</sub>-edge in order explore dependence dielectric constant excitation fluence. future impact that such emission will development wave-mixing methods XUV/soft X-ray range is addressed discussed.