Angular distribution of electrons from multiphoton ionization by an elliptically polarized laser field

Krstić, Predrag; Mittleman, Marvin H.

doi:10.1103/physreva.44.5938

Cited by 25 publications

(15 citation statements)

References 16 publications

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“…[23][24][25]. This was soon realized to be an effect of the Coulomb potential [26][27][28][42][43][44]. Other examples are the predominant ionization when the field points along the major axis resulting in peaks in the photoelectron momentum distribution along the minor axis [41,45,46], asymmetries in the photoelectron angular distributions resulting from the ionization of the oriented molecules [47][48][49][50][51][52], attosecond angular streaking [53,54], and the possibility of detailed exploration of Stark and polarization effects in the initial tunneling step [55].…”

Section: Introductionmentioning

confidence: 99%

Ionization in elliptically polarized pulses: Multielectron polarization effects and asymmetry of photoelectron momentum distributions

2012

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In the tunneling regime we present a semiclassical model of above-threshold ionization with inclusion of the Stark shift of the initial state, the Coulomb potential, and a polarization induced dipole potential. The model is used for the investigation of the photoelectron momentum distributions in close to circularly polarized light, and it is validated by comparison with ab initio results and experiments. The momentum distributions are shown to be highly sensitive to the tunneling exit point, the Coulomb force, and the dipole potential from the induced dipole in the atomic core. This multielectron potential affects both the exit point and the dynamics, as illustrated by calculations on Ar and Mg. Analytical estimates for the position of the maximum in the photoelectron distribution are presented, and the model is compared with other semiclassical approaches.

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Section: Introductionmentioning

confidence: 99%

Ionization in elliptically polarized pulses: Multielectron polarization effects and asymmetry of photoelectron momentum distributions

2012

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“…The standard SFA technique has also been modified to include Coulomb field effects of the atomic core. The simplest * klaiber@mpi-hd.mpg.de heuristic approach is the so-called Coulomb-Volkov ansatz in which the Volkov wave function in the SFA matrix element is replaced by a heuristic Coulomb-Volkov wave function [39][40][41][42][43][44][45][46][47][48][49]. In the latter the Coulomb field is taken into account via an incorporation of the asymptotic phase of the exact Coulomb-continuum wave function into the phase of the heuristic Coulomb-Volkov wave function [50].…”

Section: Introductionmentioning

confidence: 99%

Above-threshold ionization with highly charged ions in superstrong laser fields. I. Coulomb-corrected strong-field approximation

Klaiber¹,

Yakaboylu²,

Hatsagortsyan³

2013

Phys. Rev. A

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Aiming at the investigation of above-threshold ionization in superstrong laser fields with highly charged ions, we develop a Coulomb-corrected strong-field approximation (SFA). The influence of the Coulomb potential of the atomic core on the ionized electron dynamics in the continuum is taken into account via the eikonal approximation, treating the Coulomb potential perturbatively in the phase of the quasiclassical wave function of the continuum electron. In this paper the formalism of the Coulomb-corrected SFA for the nonrelativistic regime is discussed, employing velocity and length gauge. Direct ionization of a hydrogenlike system in a strong linearly polarized laser field is considered. The relation of the results in the different gauges to the Perelomov-Popov-Terent'ev imaginary-time method is discussed.

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“…such as the strong field approximation (SFA)) and requires a more detailed account of the binding potential. Indeed, such more detailed analyses [47,48] predict the observed two-fold symmetry of the ADs (instead of a four-fold one, as in the case of linear polarization). The general treatment of the ED effect in three-dimensional photoelectron ADs for two-photon ionization of atoms and rather extensive numerical results for the hydrogen |nl states with n 10 can be found in [49] (see also [32,50] on dichroic effects in twocolour, two-and three-photon ionization processes).…”

Section: Brief Survey Of Dichroic Effects In Unpolarized Atom Photoprmentioning

confidence: 99%

Multiphoton detachment of a negative ion by an elliptically polarized, monochromatic laser field

Manakov

Frolov

Borca

et al. 2003

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

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The quasistationary quasienergy state approach (QQES) is applied to the analysis of partial (n-photon) decay rates and angular distributions (ADs) of photoelectrons produced by an elliptically polarized laser field. The problem is formulated for a weakly bound electron with an energy E 0 in the threedimensional δ-model potential (which approximates the short-range potential of a negative ion) interacting with a strong monochromatic laser field having an electric vector F (ωt). The results presented cover weak (perturbative), strong (nonperturbative), and superstrong field regimes as well as a wide interval of frequencies ω extending from the tunnelling (hω |E 0 |) and multiphoton (hω < |E 0 |) cases up to the high frequency domain (hω > |E 0 |).For a weak laser field, exact equations for the normalization factor and for the Fourier coefficients of the QQES wavefunction at the origin (|r| → 0) (that are key elements of the QQES approach for a δ-model potential) as well as for the detachment amplitudes are analysed analytically using both standard RayleighSchrödinger perturbation theory (PT) in the intensity, I , of the laser field and Brillouin-Wigner PT expansions involving the exact (complex) quasienergy . The lowest-order perturbative results for the n-photon ADs are presented in analytic form, and the parametrization of ADs in terms of polarization-and angular-independent atomic parameters is discussed for the general case of elliptical polarization. The major emphasis is on the analysis of an ellipticity induced distortion of three-dimensional ADs and, especially, on the elliptic dichroism (ED) effect, i.e. the dependence of the photoelectron yield in a fixed direction n on the sign of the ellipticity (or on the helicity) of a laser field. The dominant role of binding potential effects for a correct description of ED and threshold effects is demonstrated, and the intimate relationship between atomic ED factors and scattering phases of the detached electron is established for multiphoton detachment, including the above-threshold case. For a strong laser field, we present an accurate derivation for the QQES wavefunction and decay rates in the Keldysh approximation (KA) from exact QQES equations, including analytical, first-order ('rescattering') corrections to the KA results. The symmetries of ADs and the existence of ED are established using the exact analytical result for the n-photon detachment amplitude. Accurate numerical results are presented for the variation of the structure of the ADs as well as of the ED effect with increasing laser intensity.For the high frequency case,hω > |E 0 |, a rigorous analytical treatment of higher-order PT effects is presented for one-photon detachment, taking into account corrections of higher orders in I to the well-known photodetachment cross section for a short-range potential. Together with the exact numerical analysis of the total and partial decay rates forhω > |E 0 |, these results demonstrate the existence of a quasistationary stabilization regime in the de...

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Angular distribution of electrons from multiphoton ionization by an elliptically polarized laser field

Cited by 25 publications

References 16 publications

Ionization in elliptically polarized pulses: Multielectron polarization effects and asymmetry of photoelectron momentum distributions

Ionization in elliptically polarized pulses: Multielectron polarization effects and asymmetry of photoelectron momentum distributions

Above-threshold ionization with highly charged ions in superstrong laser fields. I. Coulomb-corrected strong-field approximation

Multiphoton detachment of a negative ion by an elliptically polarized, monochromatic laser field

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