A5056767894- Atomic and Molecular Physics
- Laser-Matter Interactions and Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Mechanics and Applications
- Quantum Information and Cryptography
- Nuclear physics research studies
- Mass Spectrometry Techniques and Applications
- Photorefractive and Nonlinear Optics
- Muon and positron interactions and applications
- Laser-Plasma Interactions and Diagnostics
- Spectroscopy and Quantum Chemical Studies
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Particle accelerators and beam dynamics
- Laser-induced spectroscopy and plasma
- Solid State Laser Technologies
- Advanced Fiber Laser Technologies
- Astro and Planetary Science
- Optical and Acousto-Optic Technologies
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Photolithography Techniques
- Quasicrystal Structures and Properties
- High-pressure geophysics and materials
- Dust and Plasma Wave Phenomena
- Fluid Dynamics and Heat Transfer
University of Rostock
2020-2025
Kansas State University
2019-2021
Bariloche Atomic Centre
2012-2017
Balseiro Institute
2012-2017
Comisión Nacional de Energía Atómica
2012-2017
Centro Científico Tecnológico - San Juan
2015-2017
Universidad Nacional de Cuyo
2012-2017
HUN-REN Institute for Nuclear Research
2016
Hungarian Academy of Sciences
2016
University of Chile
2012
High-order harmonic generation (HHG) from crystals is emerging as a new ultrashort source of coherent extreme ultraviolet (XUV) light. Doping the crystal structure can offer way to control properties. Here, we present study HHG enhancement in XUV spectral region an ionic crystal, using dopant-induced vacancy defects, driven by laser centered at wavelength 1.55 μm. Our numerical simulations based on solutions semiconductor Bloch equations and density-functional theory are supported our...
We analytically and numerically investigate the emission of high-order harmonic radiation from model solids by intense few-cycle midinfrared laser pulses. In single-active-electron approximation, we expand active electron's wave function in a basis adiabatic Houston states describe solid's electronic band structure terms an adjustable Kronig-Penney potential. For generation (HHG) MgO crystals, examine spectra two-band converged multiband numerical calculations. discuss characteristics intra-...
This study investigates how the presence of quantum vortices affects ionization cross-section helium atoms by 75 keV proton impact, with special attention to region near electron capture continuum (ECC) cusp. It has been found that these cause a significant reduction in intensity |T|2 distribution low-energy ECC cusp, leading considerable distortion facilitates its experimental determination. Furthermore, analysis shows one coincides Thomas angle (a parameter coming from classical...
Introducción: Los estilos de vida (EV) abarcan diversos aspectos importantes como el tiempo libre, la actividad física, consumo sustancias psicoactivas, tabaco, alcohol y los hábitos alimentarios, siendo estos últimos especialmente cruciales para desarrollo mantenimiento una saludable. Objetivo: determinar alimentarios estudiantes 3° 4° año las carreras Psicología Enfermería universidad privada Chillán, Chile. Métodos: Estudio cuantitativo transversal descriptivo. La muestra estuvo...
The projectile beam coherence effects occurring in ion-atom collisions are analyzed on the basis of recent theory Karlovets et al. [Phys. Rev. A 92, 052703 (2015)] developed for elastic scattering wave packets particles off a potential field. This is generalized to estimate loss inelastically scattered projectiles ionizing collisions. results obtained by suggested model compared with experimental data ionization hydrogen atoms and molecules 75-keV proton impact. Significantly improved...
We theoretically investigate the emission of high-harmonic (HH) radiation in model crystals by bichromatic few-cycle driving pulses that are composed as phase-coherent superposition a mid-infrared fundamental pulse and its second harmonic. Adjusting model-crystal parameters to reproduce lowest band gap MgO, we examine extent which distinct domains HH spectrum can be controlled enhanced tuning temporal profile laser electric field. change driving-pulse shape varying...
The presence of vortices in the ionization hydrogen atoms by positrons at intermediate impact energies is investigated. present findings show that a previously reported minimum fully differential cross section signature vortex continuum positron–electron–proton system. behaviour real and imaginary parts complex-valued transition matrix studied order to determine characterize momentum space. obtained information translated sections, feasible being measured with currently available techniques.
By means of a systematic theoretical study the transition matrix element T for ionization collisions in collinear geometry, we uncover presence three isolated zeros at intermediate impact energies. We demonstrate that these actually represent vortices generalized velocity field associated to T. One is shown be related deep minimum observed more than two decades ago by Brauner and Briggs 1991 extremely large energies, where corresponding fully differential cross section was too small...
We have measured fully differential cross sections for electron capture in 75 keV $p+{\mathrm{H}}_{2}$ collisions with subsequent dissociation of the intermediate molecular ${\mathrm{H}}_{2}^{+}$ ion by vibrational excitation using different projectile coherence lengths. Data were obtained two orientations as a function scattering angle. Two types interference, single- and two-center identified. The interference structure is phase shifted $\ensuremath{\pi}$ compared to what we expected....
We study the time evolution of an incoherent mixture quantum states and demonstrate, in very simple terms, a mechanical equivalent van Cittert -Zernike theorem, which can be easily explained to Quantum Physics students with basic knowledge density matrix theory.Finally, we exemplify this result by applying it quantitative analysis coherence beam particles atomic collisions.
After being overlooked for decades, the presence of quantum vortices in atomic ionization processes was recently uncovered both theoretically and experimentally. On other hand, electron capture to continuum cusp is one most conspicuous well-studied features multiple differential cross section atoms by impact positively charged projectiles. Here we analyze conditions these two structures approach each configuration space transition matrix element, effects that this encounter might produce.
We uncovered the morphology of quantum vortex structures in positron-atom ionization collisions. By performing an exhaustive calculation position vortices final momentum space problem with only one kinematic restriction, we could elucidate that form a closed structure, which is two possible scenarios for their emergence three dimensions. This first time these are fully calculated positron atom
We analyze the influence of coherence projectile’s beam in scattering phenomena. focus our study ionization He by C 6 + projectiles at 100 MeV/amu. assess this effect performing a Born initial state and continuum distorted wave final (CDW-B1) calculation together with rigorous procedure to account for properties beam. These calculations, which had been previously performed only perpendicular collision planes within First approximation (FBA), were repeated an ampler set planes. Additionally,...
We study the time evolution of an incoherent mixture identical particles by solving Liouville - von Neumann equation for corresponding density matrix. demonstrate quantum mechanical equivalent van Cittert Zernike theorem, and apply these results to quantitative analysis coherence a beam in atomic collisions.
The fundamental indication of the departure quantum mechanics from classical world is so-called coherence. Typically, we define it as characteristic systems which are in a superposition states yielding interference patterns certain kinds experiments. In addition to its captivating philosophical implications, coherence turned out be valuable tool different areas, ranging information biology, where was used describe several processes. Here, go one step further study how uncertainties mixture...
This article continues and completes a recent one regarding quantum version of van Cittert–Zernike's theorem (Fabre et al 2018 Eur. J. Phys. 39 015401). In that paper, we considered mixture states only differed in their initial positions, but not on momenta. Here, relax this nonphysical assumption analyse how the inclusion both classical uncertainties position momentum of—otherwise identical—free which do interact with an environment, affects its coherence length. We show mathematical...
We study the appearance of quantum vortices in ionization atoms by positron impact. avoid standard restrictions on final-state variables, order to as submanifolds codimension 2 multidimensional space definition T-matrix element. In particular we demonstrate that three isolated previously observed under a collinear geometry, actually correspond two-dimensional cut single vortex line.
Vortices are structures known in our daily lives and observed a wide variety of systems, from cosmic to microscopic scales. Relatively recent studies showed that vortices could also appear simple quantum systems. For instance, they were experimentally theoretically as isolated zeros the differential cross section atomic ionization processes by impact charged particles. In this work, we show appearance these point was not due any intrinsic property them, but use restrictive geometries their...
In the study of collision processes, a series conditions is usually assumed. One them that beam projectiles coherent in lengths greater than those targets against which it strikes. However, recent experimental results and theoretical analyzes have shown this assumption can not only fail, but possible to manipulate coherence length experimentally go from situation an incoherent one. The most conspicuous studied manifestation such loss disappearance interference effects. present work we show...
We investigated single ionization in proton-helium-collisions at 0.5, 1 and 2 MeV for various beam properties (divergence/coherence length).
Synopsis We numerical and analytically investigate the electron dynamics of high-order harmonic generation (HHG) in solids driven by strong mid-infrared few-cycle laser pulses. Our model distinguishes contributions to HH yield from (i) intra- interband transitions (ii) central Γ–point first Brillouin zone (BZ) versus entire BZ initial valence band.
Synopsis We analyze the influence of coherence projectile’s beam in scattering phenomena. focus our study ionization He by C 6+ projectiles at 100 MeV/amu. Our calculations, which had been previously performed for only and perpendicular collision planes within First Born approximation, were repeated an ampler set with a more refined model. obtain very good agreement experimental results.