Particle-atom ionising collisions in the presence of a laser radiation field

Cavaliere, P.; Ferrante, G.; Leone, Cláudio

doi:10.1088/0022-3700/13/22/021

Cited by 123 publications

(53 citation statements)

References 22 publications

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“…That function, when used in a nonvariational calculation of the field-free ionization amplitude [10],leads to impressive agreement with experiment in a range of scattering energies above 100 eV, yet below values at which the Born approximation is adequate. One has reason to expect, therefore, that the approach described below may provide some improvement over methods proposed earlier [4,17], based on the Coulomb-Born approximation, with field effects incorporated through the introduction of a Volkov phase factor.…”

Section: Low-frequency Approximationsmentioning

confidence: 99%

Configuration-space methods for Coulomb scattering in a laser field

Rosenberg

Zhou

1992

Phys. Rev. A

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The Volkov wave function describing the motion of a charged particle in a laser field serves as a modified plane wave in the formulation of external-field collision theory and is widely used in applications. Exact solutions are unavailable for those cases in which the target, as well as the projectile, carries a net charge. It is shown that this difficulty may be overcome through the adoption of a variational forrnulation of the theory in configuration space. The essential feature of this procedure is the specification of boundary conditions to be satisfied by the trial functions whereby the combined effect of the Coulomb potential and the external field is accounted for with sufficient accuracy. Wave packets constructed from such trial functions satisfy the physical requirement that they follow classical trajectories at asymptotic times. The formalism is applied to the problem of potential scattering in a low-frequency external field and leads to an approximate transition amplitude that serves as a generalization of the Kroll-Watson approxirnation, reducing to it for potentials having no long-range Coulomb tail. In addition, a relatively simple Coulomb generalization of the cross-section sum rule is obtained. As a second application a lowfrequency approximation is derived for the amplitude for laser-assisted electron-impact ionization. It is based on a choice of trial functions that accounts for the effect on the asymptotic motion of these particles of the long-range final-state Coulomb interactions among pairs of charged particles, in the presence of the laser field. The applicability of this approach to multiphoton-ionization processes is discussed briefly.PACS number(s): 34.80. Qb, 03.65.Nk

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Section: Low-frequency Approximationsmentioning

confidence: 99%

Configuration-space methods for Coulomb scattering in a laser field

Rosenberg

Zhou

1992

Phys. Rev. A

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“…Equations (5) to (7) can easily be solved for the three unknowns al, a 2 and a a. The characteristic equation corresponding to the above homogeneous equations is given by…”

Section: Dynamics Of the Molecule-field Systemmentioning

confidence: 99%

“…These processes have been investigated both theoretically [1][2][3][4][5][6][7][8][9][10][11] and experimentally [12,13] by many authors.…”

Section: Introductionmentioning

confidence: 99%

Excitation of molecular vibration on collision with an atom (or a molecule) in the presence of an infrared laser beam

Mohan

1983

Molecular Physics

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A general theory of excitation of a diatomic molecule due to collision with an atom (or a molecule), for example the He-HF system, in the presence of an infrared laser beam is presented. The effect of collision on the radiative excitation process is investigated by changing the various collision parameters, for example the impact parameter, collision velocity etc., with different values of molecule-field detunings.For a complete description, the quantum dynamics of excitation of a diatomic molecule due to a laser field is investigated in detail by using a quasi-energy (non-perturbative) formalism.

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“…An addition of a laser field leads to essential modifications (dressing) of the target states and it also influences decisively the state of the continuum electrons, as detailed below. Previously, several publications have dealt with the (e, 2e) reaction in a laser field: at an early stage of this research field the laser modulation of the electron bound state was neglected, and the target state was described simply by the field-free wavefunction [9]. Later on Joachain and coworkers investigated the case of an atomic hydrogen [10,11] and of helium [12,13].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted (e, 2e) reaction in one-electron atoms and ions

Berakdar

Zhang

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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We study the ionization of a hydrogenic target by the impact of moderate energy electrons and in the presence of a laser field. This process, generally referred to as the laser-assisted (e, 2e), is treated non-relativistically as follows: we evaluate the S-matrix elements using Volkov and Coulomb-Volkov wavefunctions for describing respectively the continuum states of the scattered and the ejected electrons. The dressed state of the target is described by a time-dependent wavefunction derived from a perturbation treatment (of the laser field). With the aid of numerical results we explore the dependences of the fully differential cross sections on the laser field properties such as the strength, the frequency and the polarization direction, as well as on the continuum electron energies and their emission angles. Furthermore, we assess the interplay between the laser influence and the role of scattering from the residual ion by comparing the cross sections from (one-electron) ionic targets and varying the charge state of the residual ion.

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Particle-atom ionising collisions in the presence of a laser radiation field

Cited by 123 publications

References 22 publications

Configuration-space methods for Coulomb scattering in a laser field

Configuration-space methods for Coulomb scattering in a laser field

Excitation of molecular vibration on collision with an atom (or a molecule) in the presence of an infrared laser beam

Laser-assisted (e, 2e) reaction in one-electron atoms and ions

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