Auflistung nach Schlagwort "Ionization"

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  • Adiabaticity in the lateral electron-momentum distribution after strong-field ionization 
    Henkel, Jost; Lein, Manfred; Engel, Volker; Dreissigacker, Ingo (College Park, MD : American Physical Society, 2012)
    By solving the time-dependent Schrödinger equation for atoms in short laser pulses of different polarizations, it is shown that in strong-field ionization without rescattering, the lateral width of the electron-momentum ...
  • Analysis of electron trajectories with two-color strong-field ionization 
    Henkel, Jost; Lein, Manfred (College Park, MD : American Physical Society, 2015)
    Two-color ionization of atoms with a strong 800-nm fundamental component and a weak 400-nm component with perpendicular polarization gives detailed insight into the ionization dynamics. When the delay between the two colors ...
  • Asymmetry of Wigner's time delay in a small molecule 
    Chacon, Alexis; Lein, Manfred; Ruiz, Camilo (College Park, MD : American Physical Society, 2014)
    Ionization by an attosecond pulse launches an electron wave packet in the continuum which contains rich information about the pulse, the parent system, and the ionization dynamics. This emission process is not instantaneous ...
  • Boosting terahertz generation in laser-field ionized gases using a sawtooth wave shape 
    Martínez, P.G.D.A.; Babushkin, I.; Bergé, L.; Skupin, S.; Cabrera-Granado, E.; Köhler, C.; Morgner, Uwe; Husakou, A.; Herrmann, J. (American Physical Society, 2015)
    Broadband ultrashort terahertz (THz) pulses can be produced using plasma generation in a noble gas ionized by femtosecond two-color pulses. Here we demonstrate that, by using multiple-frequency laser pulses, one can obtain ...
  • Determination of ionization and tunneling times in high-order harmonic generation 
    Zhao, Jing; Lein, Manfred (College Park, MD : American Physical Society, 2013)
    From the numerical solution of the time-dependent Schrödinger equation, we obtain the times of ionization and return of the laser-driven electron in high-order harmonic generation by probing the dynamics with a second ...
  • Dissociation and ionization of HeH+in sub-cycle-controlled intense two-color fields 
    Oppermann, F.; Wustelt, P.; Florin, T.; Mhatre, S.; Gräfe, S.; Paulus, G.G.; Lein, M. (Bristol : Institute of Physics Publishing, 2020)
    Using quantum-mechanical, one-dimensional, non-Born-Oppenheimer simulations we study the control over the strong-field dynamics of the helium hydride molecular ion HeH+ due to interaction driven by short and strong two-color ...
  • Double-slit photoelectron interference in strong-field ionization of the neon dimer 
    Kunitski, Maksim; Eicke, Nicolas; Huber, Pia; Köhler, Jonas; Zeller, S.; Voigtsberger, J.; Schlott, Nikolai; Henrichs, Kevin; Sann, H.; Trinter, F.; Schmidt, L.; Kalinin, Anton; Schöffler, M.; Jahnke, T.; Lein, Manfred; Dörner, R. (London : Nature Publishing Group, 2019)
    Wave-particle duality is an inherent peculiarity of the quantum world. The double-slit experiment has been frequently used for understanding different aspects of this fundamental concept. The occurrence of interference ...
  • Interference in above-threshold-ionization electron distributions from molecules 
    Henkel, Jost; Lein, Manfred; Engel, Volker (College Park, MD : American Physical Society, 2011)
    We present quantum-mechanical studies on above-threshold ionization of molecular ions in two and three dimensions. The momentum distributions show signatures of interfering emissions from the molecular centers. These ...
  • Light-matter interaction on the few- and sub-cycle timescale 
    Babushkin, Ihar (Hannover : Institutionelles Repositorium der Leibniz Universität Hannover, 2018)
    One of the main challenges in modern optics is to explore shorter times scales as well as to extend the frequency range to higher but also to lower frequencies. Last years, the time scales available have been shifted to ...
  • Model calculations of the ionization relaxation and radiative cooling in unsteady krypton and xenon shock waves 
    Krauss-Varban, D.; Demmig, F. (Cambridge : Cambridge University Press, 1984)
    The ionization relaxation and radiative cooling of weakly unsteady shock waves in krypton and xenon is examined. We find that, besides radiation energy loss, the shock-tube boundary layers and shock attenuation strongly ...
  • Model computations of the influence of carbon impurities on the ionization relaxation in krypton shock waves 
    Klages, D.; Demmig, F. (Cambridge : Cambridge University Press, 1991)
    Chemical reactions in shock waves can be strongly affected by minute impurity concentrations. Thus it is not adequate to take into account the additional impurity electron production in relaxation studies simply by global ...
  • Molecular imaging using high-order harmonic generation and above-threshold ionization 
    van der Zwan, Elmar V.; Lein, Manfred (College Park, MD : American Physical Society, 2012)
    Accurate molecular imaging via high-order harmonic generation relies on comparing harmonic emission from a laser-irradiated molecule and an adequate reference system. However, an ideal reference atom with the same ionization ...
  • Multiphoton double ionization of Ar and Ne close to Threshold 
    Liu, Yunquan; Ye, Difa; Liu, Jie; Rudenko, A.; Tschuch, S.; Dürr, M.; Siegel, M.; Morgner, Uwe; Gong, Qihuang; Moshammer, R.; Ullrich, J. (American Physical Society, 2010)
    In kinematically complete studies we explore double ionization (DI) of Ne and Ar in the threshold regime (I>3×1013W/cm2) for 800 nm, 45 fs pulses. The basic differences are found in the two-electron momentum distribution ...
  • Non-perturbative semiclassical model for strong-field ionization 
    Shvetsov-Shilovski, N.I.; Lein, M.; Madsen, L.B.; Räsänen, E.; Lemell, C.; Burgdörfer, J.; Arbó, D.G.; Tkési, K. (Bristol : Institute of Physics Publishing, 2017)
    Synopsis We present a non-perturbative semiclassical model for strong-field ionization that accounts for path interferences of tunnel-ionized electrons in the ionic potential within the framework of a classical trajectory ...
  • Picosecond laser filamentation in air 
    Schmitt-Sody, Andreas; Kurz, Heiko G.; Bergé, Luc; Skupin, Stefan; Polynkin, Pavel (Bristol : Institute of Physics Publishing, 2016)
    The propagation of intense picosecond laser pulses in air in the presence of strong nonlinear self-action effects and air ionization is investigated experimentally and numerically. The model used for numerical analysis is ...
  • Preparing attosecond coherences by strong-field ionization 
    Pabst, Stefan; Lein, Manfred; Wörner, Hans Jakob (College Park, MD : American Physical Society, 2016)
    Strong-field ionization (SFI) has been shown to prepare wave packets with few-femtosecond periods. Here, we explore whether this technique can be extended to the attosecond time scale. We introduce an intuitive model, which ...
  • Semiclassical two-step model for strong-field ionization 
    Shvetsov-Shilovski, N.I.; Lein, Manfred; Madsen, L.B.; Räsänen, E.; Lemell, C.; Burgdörfer, J.; Arbó, D.G.; Tokési, K. (College Park, MD : American Physical Society, 2016)
    We present a semiclassical two-step model for strong-field ionization that accounts for path interferences of tunnel-ionized electrons in the ionic potential beyond perturbation theory. Within the framework of a classical ...
  • Signatures of Molecular Orbital Structure in Lateral Electron Momentum Distributions from Strong-Field Ionization 
    Petersen, Ingo; Henkel, Jost; Lein, Manfred (College Park, MD : American Physical Society, 2015)
    Strong-field ionization of aligned diatomic and polyatomic molecules such as O2, N2, C2H4, and others in circularly polarized laser fields is investigated theoretically. By calculating the emission-angle-resolved lateral ...
  • Strong-field double ionization of Ar below the recollision threshold 
    Liu, Yunquan; Tschuch, S.; Rudenko, A.; Dürr, M.; Siegel, M.; Morgner, Uwe; Moshammer, R.; Ullrich, J. (American Physical Society, 2008)
    Nonsequential double ionization of Ar by 45 fs laser pulses (800 nm) at (4-7)×1013W/cm2 was explored in fully differential measurements. Well below the field-modified recollision threshold we enter the multiphoton regime. ...
  • Symmetry Breaking and Strong Persistent Plasma Currents via Resonant Destabilization of Atoms 
    Brée, C.; Hofmann, M.; Demircan, A.; Morgner, Uwe; Kosareva, O.; Savel'Ev, A.; Husakou, A.; Ivanov, M.; Babushkin, I. (American Physical Society, 2017)
    The ionization rate of an atom in a strong optical field can be resonantly enhanced by the presence of long-living atomic levels (so-called Freeman resonances). This process is most prominent in the multiphoton ionization ...