Direct and Indirect Pathways in Strong Field Atomic Ionization Dynamics

Bohan, A de; Piraux, Bernard; Ponce, Lino; Taïeb, Richard; Véniard, Valérie; Maquet, Alfred

doi:10.1103/physrevlett.89.113002

Cited by 38 publications

(18 citation statements)

References 17 publications

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“…51,52 This is in line with the fact that in conductivity models, two-stage processes are often adopted. However for the hydrogen atom, a pure tunneling mechanism does not fit with numerical solutions of the time-dependent Schrödinger equation, and it is indicated that an indirect tunneling mechanism is important.…”

Section: Two-stage Processmentioning

confidence: 62%

Field dependence on the molecular ionization potential and excitation energies compared to conductivity models for insulation materials at high electric fields

Smalø

Hestad

Ingebrigtsen

et al. 2011

Journal of Applied Physics

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High-resolution pulsed-field-ionization zero-kinetic-energy photoelectron spectroscopic study of the two lowest electronic states of the ozone cation O 3 + Rotationally resolved pulsed field ionization photoelectron study of CO + (X 2 Σ + ,v + =0-42) in the energy range of 13.98-21.92 eVThe aim is to improve the understanding of high-field phenomena (such as preinception currents/conduction, streamer initiation and propagation) in insulating materials in terms of the molecular properties of the substances involved. In high electric fields, ionization is a likely process, and in all such processes, the ionization potential is an important parameter. A fundamental question is how these processes depend on the electric field, and therefore, based on the interaction between a negative point charge and a molecular cation as modeled by density functional theory, a field-dependent model for the ionization potential is developed. In addition, the first excitation energies as a function of the electric field are calculated using time-dependent density functional theory. It is demonstrated that empirical high-field conduction models for cyclohexane and n-tridecane can be explained in terms of the difference between the ionization potential and the first excitation energy. It is also suggested that the reduction of the ionization potential with electric fields, can help explain how fast-mode streamers propagate.

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Section: Two-stage Processmentioning

confidence: 62%

Field dependence on the molecular ionization potential and excitation energies compared to conductivity models for insulation materials at high electric fields

Smalø

Hestad

Ingebrigtsen

et al. 2011

Journal of Applied Physics

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show abstract

“…Research in the last two decades has confirmed that Coulomb focusing (and the Coulomb field in general) is a key player in the recollision process [8][9][10][11][12]. But it seems that the opposite question -namely, when the Coulomb focusing does not matter-has not received the same attention.…”

Section: Introductionmentioning

confidence: 99%

Persistence of Coulomb focusing during ionization in the strong-field regime

2015

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We consider the recollision process occurring during the ionization of a neutral atom or molecule by a very strong linearly polarized near-infrared laser field. We find that Coulomb focusing persists even when the Coulomb field of the ion is barely noticeable compared with the laser field. We focus on the consequences of Coulomb focusing for trajectories that maximize the energy exchange upon recollision and thus determine the high-harmonic cutoff. Delayed recollisions proliferate in the strong field regime and bring back energy slightly above the 3.17 U p high-harmonic cutoff (where U p is the pondermotive energy), in stark contradiction with the Strong Field Approximation. We investigate the nonlinear-dynamical phase space structures which underlie this dynamics. It is found that the energetic delayed recollisions are organized by a reduced number of periodic orbits and their invariant manifolds.

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“…In fact, it has been identified as responsible for the low-energy structure [51,52] and the ionization suppression in the extremely-low-energy part of the ATI spectra [53] measured in experiments. Theoretical results have indeed shown that such features are due to the presence of the Coulomb potential [49,54]. Therefore, it is important to stress how our results would be modified should the residual binding potential be included in our computations.…”

Section: Discussionmentioning

confidence: 85%

“…On a quantitative level, it underestimates the ionization rates for direct ATI, as compared to the TDSE. For studies of how the SFA behaves as compared to the TDSE for several driving-field wavelengths, see [49,50].…”

Section: Discussionmentioning

confidence: 99%

Temporal and spatial interference in molecular above-threshold ionization with elliptically polarized fields

Lai

Faria

2013

Phys. Rev. A

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We investigate direct above-threshold ionization in diatomic molecules, with particular emphasis on how quantum interference is altered by a driving field of nonvanishing ellipticity. This interference may be either temporal, i.e., related to ionization events occurring at different times, or spatial, i.e., related to the electron emission at different centers in the molecule. Employing the strong-field approximation and saddle-point methods, we find that, in general, for nonvanishing ellipticity, there will he a blurring of the temporal and spatial interference patterns. The former blurring is caused hy the electron velocity component perpendicular to the major polarization axis, while spatial interference is washed out as a consequence either oïs-p mixing or of the temporal dependence of the ionization prefactor. Both types of interference are analyzed in detail in terms of electron trajectories, and specific conditions for which sharp fringes occur are provided.

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Direct and Indirect Pathways in Strong Field Atomic Ionization Dynamics

Abstract: With the help of a suitably chosen momentum-space analysis, we study some of the basic mechanisms governing the physics of the processes occurring when atoms are submitted to intense infrared laser pulses, with peak intensities 10(14) W cm(-2) Show more

Cited by 38 publications

References 17 publications

Field dependence on the molecular ionization potential and excitation energies compared to conductivity models for insulation materials at high electric fields

Field dependence on the molecular ionization potential and excitation energies compared to conductivity models for insulation materials at high electric fields

Persistence of Coulomb focusing during ionization in the strong-field regime

Temporal and spatial interference in molecular above-threshold ionization with elliptically polarized fields

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