A5025618745- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Advanced Chemical Physics Studies
- Mass Spectrometry Techniques and Applications
- Advanced X-ray Imaging Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- Electron and X-Ray Spectroscopy Techniques
- Laser-induced spectroscopy and plasma
- Spectroscopy and Quantum Chemical Studies
- Advanced Electron Microscopy Techniques and Applications
- Particle Accelerators and Free-Electron Lasers
- Laser-Plasma Interactions and Diagnostics
- Laser Design and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum optics and atomic interactions
- Ion-surface interactions and analysis
- Photocathodes and Microchannel Plates
- Advanced Fiber Laser Technologies
- Crystallography and Radiation Phenomena
- Nuclear Physics and Applications
- Atomic and Subatomic Physics Research
- Advanced Materials Characterization Techniques
- Nuclear physics research studies
- Enzyme Structure and Function
- Spectroscopy and Laser Applications
Lomonosov Moscow State University
2016-2025
Max Planck Institute for Nuclear Physics
2025
ITMO University
2022-2024
Pacific National University
2023-2024
University of Freiburg
1994-2022
Institute of Nuclear Physics
2021
Drake University
2002-2019
European X-Ray Free-Electron Laser
2017
Joint Institute for High Temperatures
2016
Helmholtz Institute Jena
2015
Abstract We publish three Roadmaps on photonic, electronic and atomic collision physics in order to celebrate the 60th anniversary of ICPEAC conference. In Roadmap I, we focus light–matter interaction. this area, studies ultrafast molecular dynamics have been rapidly growing, with advent new light sources such as attosecond lasers x-ray free electron lasers. parallel, experiments established synchrotron radiation femtosecond using cutting-edge detection schemes are revealing scientific...
We have used the matrix iteration method of Nurhuda and Faisal [Phys. Rev. A 60, 3125 (1999)] to treat ionization atomic hydrogen by a strong laser pulse. After testing our predictions against variety previous calculations, we present ejected-electron spectra as well angular distributions for few-cycle infrared pulses with peak intensities up ${10}^{15}$ W/cm${}^{2}$. It is shown that convergence results number partial waves serious issue, which can be managed in satisfactory way using...
We report photoelectron energy spectra, momentum, and angular distributions for the strong-field single ionization of lithium by 30-fs laser pulses. For peak intensities between ${10}^{11}$ ${10}^{14}$ W/cm${}^{2}$ at a central wavelength 785 nm, classical over-the-barrier intensity was reached well inside multiphoton regime. The complete vector momenta fragments were recorded reaction microscope with magneto-optically trapped target (MOTREMI). On theoretical side, time-dependent...
We investigate two-pathway interferences between nonresonant one-photon and resonant two-photon ionization of atomic hydrogen. In particular, we analyze in detail the photoionization mediated by fundamental frequency second harmonic a femtosecond VUV pulse when is tuned near an intermediate state. Following our recent study [Phys. Rev. A 91, 063418 (2015)] such effects with linearly polarized light, similar situation circularly radiation. As consequence richer structure characterized its...
Studying the dynamics of dark states is challenging due to their inability undergo single-photon emission or absorption. This challenge made even more difficult for autoionizing owing ultrashort lifetime a few femtoseconds. High-order harmonic spectroscopy recently appeared as novel method probe ultrafast single atomic molecular state. Here, we demonstrate emergence new type resonance state manifestation coupling between Rydberg and dressed by laser photon. Through high-order generation,...
The angular distribution of photoelectrons produced by excitation polarized atoms to autoionizing states is analysed. In particular, core-excited in absorption synchrotron radiation laser-pumped excited are considered. A general expression for the arbitrarily oriented laser and beams obtained further reduced a simpler form particular geometry used experiments. case an isolated state (resonance) interacting with several continua considered parametrization observable parameters region...
Abstract Here, we report, that by means of direct irradiation lithium fluoride a (LiF) crystal, in situ 3D visualization the SACLA XFEL focused beam profile along propagation direction is realized, including inside photoluminescence solid matter. High sensitivity and large dynamic range LiF crystal detector allowed measurements intensity distribution at distances far from best focus as well near evaluation source size quality factor M 2 . Our also support theoretical prediction for X-ray...
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...
Quantum mechanically, photoionization can be fully described by the complex amplitudes that describe transition between ground state and continuum state. Knowledge of value phase these has been a central interest in studies newly developing attosecond science, since reveal important information about phenomena such as electron correlation. We present new attosecond-precision interferometric method angle-resolved measurement for amplitudes, using two phase-locked Extreme Ultraviolet pulses...
Until recently, theoretical and experimental studies of photoelectron angular distributions (PADs) including nondipole effects in atomic photoionization have been performed mainly for the conventional plane-wave radiation. One can expect, however, that contributions to angular- polarization-resolved properties are enhanced if an target is exposed twisted light. The purpose present study develop a theory PADs case light, especially many-electron atoms. analysis experimentally relevant...
The reconstruction of attosecond beating by interference two-photon transitions (RABBITT) setup is theoretically studied for various combinations extreme ultraviolet and infrared (IR) field components polarization: ``$\mathrm{linear}+\mathrm{linear}$,'' ``$\mathrm{linear}+\mathrm{circular}$'' with crossed propagation directions, ``$\mathrm{circular}+\mathrm{circular}$'' parallel directions. We examine the general properties photoelectron angular distributions their response to variation IR...
Attosecond photoelectron interferometry based on the combination of an attosecond pulse train and a synchronized infrared field is fundamental technique for temporal characterization waveforms investigation electron dynamics in photoionization process. In this approach, comb extreme ultraviolet harmonics typically lies above ionization threshold target under investigation, thus releasing by single-photon absorption. The interaction outgoing with results absorption or emission photons,...
We have observed the direct L(2,3)MMM double Auger transition after photoionization of 2p shell argon by angle-resolved electron-electron coincidence spectroscopy. The process is responsible for about 20% electron intensity. In contrast to normal lines, spectra in decay show a continuous intensity distribution. energy and angular distributions emitted electrons allow one obtain information on correlations giving rise as well symmetry associated two-electron continuum state.
The angle-resolved resonant Auger spectrum of Xe is investigated with a record high meV energy resolution in the kinetic region 34.45–39.20 eV at hν=65.110 eV, corresponding to excitation Xe* 4d5/2−16p state. New lines have been observed and assigned spectra. results previous measurements concerning energies, intensities angular distribution asymmetry parameters refined, complemented and, for some lines, corrected.
Accurate knowledge of the intensity focused ultrashort laser pulses is crucial to correct interpretation experimental results in strong-field physics. We have developed a technique measure intensities approaching ${10}^{15}\phantom{\rule{0.28em}{0ex}}\text{W}/{\text{cm}}^{2}$ with an accuracy 1$%$. This achieved by comparing photoelectron yields from atomic hydrogen predictions exact numerical solutions three-dimensional time-dependent Schr\"odinger equation. Our method can be extended...
The electron angular distribution after atomic photoionization by the fundamental frequency and its second harmonic is analyzed for a case when of scans region an intermediate state. left-right asymmetry, due to two-pathway interference between nonresonant one-photon resonant two-photon ionization, sharply change as function photon energy. phenomenon exemplified both solving time-dependent Schr\"odinger equation on numerical space-time grid applying perturbation theory ionization hydrogen...
The electron and ion properties observed in photoionization inherit the symmetry of both a target radiation. Introducing breaking process, one can expect to observe noticeable variation vector correlation parameters either an outgoing photoelectron or residual ion. One ways violate is irradiate matter by twisted radiation, which involves additional screw. In paper we present extension approach developed Phys. Rev. A 108, 023117 (2023) for angular distribution other parameters, specifically,...
The seeded Free-Electron Laser (FEL) FERMI is the first source of short-wavelength light possessing full coherence optical lasers, together with extreme power available from FELs. provides longitudinally coherent radiation in Extreme Ultraviolet and soft x-ray spectral regions, therefore opens up wide new fields investigation physics. We propose experiments exploiting this property to provide control photoionization neon helium, carry out numerical calculations find optimum experimental...
We investigate the coherent control of photoelectron angular distribution in bichromatic atomic ionization. Neon is selected as target since it one most popular systems current gas-phase experiments with free-electron lasers (FELSs). In particular, we tackle practical questions, such role fine-structure splitting, pulse length, and intensity. Time-dependent stationary perturbation theory are employed, also solve time-dependent Schr\"odinger equation a single-active electron model. consider...