A5066281461- Laser-Matter Interactions and Applications
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Astrophysics and Star Formation Studies
- Advanced Fiber Laser Technologies
- Atomic and Molecular Physics
- Spectroscopy and Laser Applications
- Molecular Spectroscopy and Structure
- Photochemistry and Electron Transfer Studies
- Atmospheric Ozone and Climate
- Laser Design and Applications
- Mechanical and Optical Resonators
- Laser-induced spectroscopy and plasma
- Physics of Superconductivity and Magnetism
- Spectroscopy Techniques in Biomedical and Chemical Research
- Photorefractive and Nonlinear Optics
- Photonic and Optical Devices
- Vacuum and Plasma Arcs
- Surface Treatment and Coatings
- Advanced Materials Characterization Techniques
- Advanced Sensor Technologies Research
- Terahertz technology and applications
- Advanced Fiber Optic Sensors
- Combustion and Detonation Processes
University of Bielsko-Biała
2025
Université Toulouse III - Paul Sabatier
2021-2024
Centre National de la Recherche Scientifique
2015-2024
Laboratoire Collisions Agrégats Réactivité
2023-2024
Institut Lumière Matière
2015-2024
Université Claude Bernard Lyon 1
2015-2024
Institut de Recherche en Astrophysique et Planétologie
2020-2023
Elettra-Sincrotrone Trieste S.C.p.A.
2018-2022
University of Trieste
2018-2021
Université de Toulouse
2021
Hole migration is a fascinating process driven by electron correlation, in which purely electronic dynamics occur on very short time scale complex ionized molecules, prior to the onset of nuclear motion. However, it expected that due coupling dynamics, these oscillations will be rapidly damped and smeared out, makes experimental observation hole rather difficult. In this Letter, we demonstrate instantaneous ionization benzene molecules initiates an ultrafast characterized periodic breathing...
Abstract Highly excited molecular species are at play in the chemistry of interstellar media and involved creation radiation damage a biological tissue. Recently developed ultrashort extreme ultraviolet light sources offer high excitation energies ultrafast time-resolution required for probing dynamics highly states on femtosecond (fs) (1 fs=10 −15 s) even attosecond (as) as=10 −18 timescales. Here we show that polycyclic aromatic hydrocarbons (PAHs) undergo relaxation few tens femtoseconds...
The many-body quantum nature of molecules determines their static and dynamic properties, but remains the main obstacle in accurate description. Ultrashort extreme ultraviolet pulses offer a means to reveal molecular dynamics at ultrashort timescales. Here, we report use time-resolved electron-momentum imaging combined with attosecond study highly excited organic molecules. We measure relaxation timescales that increase state energy. High-level calculations show these are intrinsic...
The x-ray emission in laser-plasma accelerators can be a powerful tool to understand the physics of relativistic interaction. It is shown here that mapping betatron radiation obtained from beam profile when an aperture mask positioned just beyond end region. influence plasma density on position and longitudinal investigated compared particle-in-cell simulations. measurement length provides insight dynamics interaction, including electron self-injection region, possible multiple injection,...
Processes in atoms or molecules on the attosecond timescale have been measured using XUV and IR femtosecond pulses overlapping time controlled with accuracy. Within this general framework, many strategies developed harmonics of fundamental pulse. In paper, we focus a specific configuration where pulse train is composed by odd dressed second harmonic light. Measuring angularly resolved photoelectron spectrum as function delay between pulses, clear oscillation anisotropy parameters appears...
Optimally doped cuprate superconductors are characterized by the presence of superconducting fluctuations in a relatively large temperature region above critical transition temperature. We reveal here that effect thermal disorder, which decreases condensate phase coherence at equilibrium, can be dynamically contrasted photoexcitation with ultrashort mid-infrared pulses. In particular, our findings light pulses photon energy comparable to amplitude gap and polarized plane along copper-copper...
Abstract We have investigated photoionization delays in N 2 by combining an extreme ultraviolet (XUV) attosecond pulse train generated high harmonic generation (HHG) and a second femtosecond with angularly resolved photoelectron spectroscopy. While delay measurements are usually performed using standard XUV-infrared scheme, here we show that the present approach allows us to separate electronic states otherwise would overlap, thus avoiding spectral congestion found most molecules. relative...
Significance Here we establish femtosecond covariance spectroscopy as a technique that uses ultrashort stochastic light pulses to measure nonlinear material responses. By using with spectrally uncorrelated fluctuations can leverage on the noise and consider each repetition of experiment measurement under different conditions. In this limit demonstrate processes in sample be retrieved by measuring spectral correlations pulses. We validate approach studying stimulated Raman scattering...
Unraveling ultrafast dynamical processes in highly excited molecular species has an impact on our understanding of chemical such as combustion or the composition clouds universe. In this article we use short (<7 fs) XUV pulses to produce cationic states benzene molecules and probe their dynamics using few-cycle VIS/NIR laser pulses. The produced by lie especially complex spectral region where multi-electronic effects play a dominant role. We show that very fast τ ≈ 20 fs nonadiabatic...
The interaction of polycyclic aromatic hydrocarbons (PAHs) with vacuum ultraviolet (VUV) photons triggers the emission well-known infrared bands (AIBs) but other mechanisms such as fragmentation can be involved in this interaction. Fragmentation leads to selection effects that favor specific sizes and structures. We investigate impact aliphatic bonds on VUV photo-stability PAH cations under conditions applicable for photodissociation regions (PDRs). Cations pyrene (C16H10) coronene (C24H12)...
Protonated mixed pyrene–water clusters, (Py) m (H 2 O) n H + , where = [1–3] and [1–10], are generated using a cryogenic molecular cluster source. Collision induced dissociation is employed to explore the proton localisation in these systems.
Ultrafast XUV chemistry is offering new opportunities to decipher the complex dynamics taking place in highly excited molecular states and thus better understand fundamental natural phenomena as molecule formation interstellar media. We used ultrashort light pulses perform pump-IR probe experiments caffeine a model of prebiotic molecule. observed 40 fs decay cationic states. Guided by quantum calculations, this time scale interpreted terms nonadiabatic cascade through large number correlated...
XUV induced dynamics in molecules is still largely unexplored while experimental and theoretical tools are becoming available several labs. In this work, we present a compact beamline designed to induce probe femtosecond attosecond gas samples (from atoms complex molecular species). The processes studied with time-resolved photoelectron or/and photoion imaging. characterization of the performances setup presented. We show results obtained naphthalene molecule showing imaging experiments...
We have studied theoretical photoelectron-momentum distributions of ${\mathrm{C}}_{60}$ using time-dependent density functional theory (TDDFT) in real time and including a self-interaction correction. Our calculations furthermore account for proper orientation averaging allowing direct comparison with experimental results. To illustrate the capabilities this (microscopic time-dependent) approach, two very different photo-excitation conditions are considered: excitation high-frequency XUV...
An investigation of how polycyclic aromatic hydrocarbons respond to extreme ultraviolet radiation provides insight into internal molecular dynamics that can help improve models interstellar chemistry.
The standard velocity-map imaging (VMI) analysis relies on the simple approximation that residual Coulomb field experienced by photoelectron ejected from a neutral or ion system may be neglected. Under this almost universal approximation, photoelectrons follow ballistic (parabolic) trajectories in externally applied electric field, and recorded image considered as 2D projection of initial velocity distribution. There are, however, several circumstances where is not justified influence...
We report here an experimental setup to perform three-pulse pump–probe measurements over a wide wavelength and temperature range. By combining two pump pulses in the visible (650 nm–900 nm) mid-IR (5 μm–20 μm) range, with broadband supercontinuum white-light probe, our apparatus enables both combined selective excitation of different material degrees freedom full time-dependent reconstruction non-equilibrium dielectric function sample. describe optical setup, cryogenic sample environment,...
Superconductivity in the cuprates is characterized by an anisotropic electronic gap of $d$-wave symmetry. The aim this work to understand how anisotropy affects nonequilibrium response high-${T}_{c}$ superconductors. Here we use a polarization selective time domain experiment address dynamics excitation different symmetry optimally doped ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{Y}}_{0.08}{\mathrm{Ca}}_{0.92}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8+\ensuremath{\delta}}$ and measure nodal antinodal...
We present a novel approach to transient Raman spectroscopy, which combines stochastic probe pulses and covariance-based detection measure stimulated signals in alpha-quartz. A coherent broadband pump is used simultaneously impulsively excite range of different phonon modes, the phase, amplitude, energy each mode are independently recovered as function pump-probe delay by noisy-probe analysis. Our experimental results associated theoretical description demonstrate feasibility 2D-Raman...
The nonlinear single and double ionization of Sr atoms as a result their interaction with 800-nm Ti-sapphire laser pulses 25-fs duration is experimentally investigated within the intensity range $I=3\phantom{\rule{0.16em}{0ex}}\mathrm{TW}\phantom{\rule{4pt}{0ex}}\mathrm{c}{\mathrm{m}}^{\text{--}2}--30\phantom{\rule{0.16em}{0ex}}\mathrm{TW}\phantom{\rule{4pt}{0ex}}\mathrm{c}{\mathrm{m}}^{\text{--}2}$. latter includes over-the-barrier intensities for both ${\mathrm{Sr}}^{+}$, while...