A5041262876- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Atomic and Molecular Physics
- Fullerene Chemistry and Applications
- Advanced Fiber Laser Technologies
- Advanced Electron Microscopy Techniques and Applications
- Spectroscopy and Laser Applications
- Electron and X-Ray Spectroscopy Techniques
- Ion-surface interactions and analysis
- Laser-Plasma Interactions and Diagnostics
- Terahertz technology and applications
- Molecular Junctions and Nanostructures
- Diamond and Carbon-based Materials Research
- Advanced X-ray Imaging Techniques
- Graphene research and applications
- Astrophysics and Star Formation Studies
- Laser Design and Applications
- Analytical Chemistry and Chromatography
- Force Microscopy Techniques and Applications
- Molecular Spectroscopy and Structure
- Photoreceptor and optogenetics research
- Advanced Materials Characterization Techniques
- Metabolomics and Mass Spectrometry Studies
Institut Lumière Matière
2016-2025
Université Claude Bernard Lyon 1
2016-2025
Centre National de la Recherche Scientifique
2016-2025
ELI-HU Research and Development Non-Profit
2017
Institut de Physique et Chimie des Matériaux de Strasbourg
2015
Laboratoire de Spectrométrie Ionique et Moléculaire
2004-2013
Institute for Atomic and Molecular Physics
2002-2009
The intefererence pattern produced by photoelectrons provides holographic snapshots of the photoionization process.
We present an interferometric pump-probe technique for the characterization of attosecond electron wave packets (WPs) that uses a free WP as reference to measure bound WP. demonstrate our method by exciting helium atoms using pulse (AP) with bandwidth centered near ionization threshold, thus creating both and simultaneously. After variable delay, is ionized few-cycle infrared laser precisely synchronized original AP. By measuring delay-dependent photoelectron spectrum we obtain interferogram...
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...
To describe the microscopic properties of matter, quantum mechanics uses wave functions, whose structure and time dependence is governed by Schrödinger equation. In atoms charge distributions described function are rarely observed. The hydrogen atom unique, since it only has one electron and, in a dc electric field, Stark Hamiltonian exactly separable terms parabolic coordinates (η, ξ, φ). As result, along ξ coordinate that exists vicinity atom, projection continuum measured at macroscopic...
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...
Photoinduced molecular processes start with the interaction of instantaneous electric field incident light electronic degrees freedom. This early attosecond motion impacts fate photoinduced reactions. We report first observation time scale electron dynamics in a series small- and medium-sized neutral molecules (N(2), CO(2), C(2)H(4)), monitoring time-dependent variations parent ion yield ionization by an pulse, thereby probing dipole induced moderately strong near-infrared laser field....
We present a combined theoretical and experimental study of ultrafast wave-packet dynamics in the dissociative ionization H_{2} molecules as result irradiation with an extreme-ultraviolet (XUV) pulse followed by infrared (IR) pulse. In experiments where duration both XUV IR pulses are shorter than vibrational period H_{2};{+}, dephasing rephasing wave packet that is formed H_{2};{+} upon neutral molecule observed. exceeds (15 fs), pronounced dependence H;{+} kinetic energy distribution on...
Midinfrared strong-field laser ionization offers the promise of measuring holograms atoms and molecules, which contain both spatial temporal information ion photoelectron with subfemtosecond angstrom resolution. We report on scaling holographic interference patterns pulse duration, wavelength, intensity. High-resolution for metastable xenon by 7-16 μm light from FELICE free electron are presented compared to semiclassical calculations that provide analytical insight.
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...
Abstract Observing the crucial first few femtoseconds of photochemical reactions requires tools typically not available in femtochemistry toolkit. Such dynamics are now within reach with instruments provided by attosecond science. Here, we apply experimental and theoretical methods to assess ultrafast nonadiabatic vibronic processes a prototypical complex system—the excited benzene cation. We use few-femtosecond duration extreme ultraviolet visible/near-infrared laser pulses prepare probe...
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...
Imaging in real time the complete dynamics of a process as fundamental photoemission has long been out reach because difficulty combining attosecond temporal resolution with fine spectral and angular resolutions. Here, we achieve full decoding intricate angle-dependent helium, spectrally anisotropically structured by two-photon transitions through intermediate bound states. Using angularly resolved electron interferometry, characterize complex-valued transition probability amplitude toward...
We demonstrate that dissociative ionization of O${}_{2}$ can be controlled by the relative delay between an attosecond pulse train (APT) and a copropagating infrared (IR) field. Our experiments reveal dependence both branching ratios range electronic states fragment angular distributions on extreme ultraviolet (XUV) to IR time delay. The observations go beyond adiabatic propagation wave packets IR-induced quasistatic potential energy curves are understood in terms coupling molecular ion.
Photoionization of acetylene by extreme ultraviolet light results in a stand-alone contribution from the outermost valence orbital, followed well-separated photoelectron bands deeper molecular orbitals. This makes an ideal candidate for probing photoionization dynamics polyatomic molecules free spectral congestion often arising after interaction with attosecond pulse train. Here, using angle-resolved interferometric technique, we extract time delays orbital relative to atomic target, namely...
Multiphoton interference measurements in attosecond physics, e.g., the reconstruction of beating by two-photon transitions (RABITT), are typical methods choice to experimentally access photoionization delay atoms and molecules. The exact relation between measurable multiphoton delays theoretical single-photon is typically modeled correction terms, continuum-continuum delays, obtained from a high-energy limit theory. However, these unreliable at photoelectron kinetic energies smaller than...
Attosecond science and technology have emerged as a promising path for improving our understanding of light–matter interaction. High harmonic generation based light sources combine high photon energy, broad spectrum, short duration with relatively compact implementation, which makes them flexible tools to study modify physical chemical properties matter by acting directly on electronic degrees freedom. Because extreme ultraviolet radiation interacts primarily outer inner valence electrons,...
We present the first experimental results of a technique called photoionization microscopy. Photoelectrons ejected in threshold Xe are detected velocity map imaging apparatus, and interferences between various trajectories by which electron moves from atom to detector observed. The structure interference pattern, contains transverse component electronic wave function, evolves smoothly with excess energy above saddle point. main observed features interpreted within framework semiclassical...
We have designed and implemented an electrostatic lens that magnifies the images of existing velocity map imaging apparatus up to a factor 20. The can be used vary magnification while keeping field strength in interaction region constant. For interest where is required (low energy ions or electrons, high external field) does not add any observable aberrations imaging. characterized performance using slow photoelectrons.