Twofold Symmetric Angular Distributions in Multiphoton Ionization with Elliptically Polarized Light

Basile, Salvatore; Trombetta, F.; Ferrante, G.

doi:10.1103/physrevlett.61.2435

Cited by 90 publications

(48 citation statements)

References 8 publications

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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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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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“…It is quite clear that for a long-range potential the plane-wave Volkov state cannot be a good candidate for a reasonable final state. In the case of the Coulomb potential, it has been tried to remedy this shortcoming by using as final state the so-called Coulomb-Volkov wave [46] but it has been shown by one of the present authors [47] that the application of such a laser-modified Coulomb state is only justified at relatively low intensities. In a recent paper an improved treatment of the Coulomb problem has been presented [10].…”

Section: U~e(t) U*~(t)[v(r) + K(r T)]u~(t)ufree(t)[z(t) ) = Ih~t Iz(mentioning

confidence: 98%

A new integral equation for treating high-intensity multiphoton processes

Varró

Ehlotzky

1993

Nouv Cim D

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Summary. --In the present paper we derive a new integral equation for the non-perturbative evaluation of transition matrix elements for high-intensity multiphoton processes. Our method will be partly based on the Kramers-Henneberger transformation. In the course of the development of our theory we shall relate our approach to previous investigations along similar lines. As a specific example we shall apply our integral equation to the problem of light scattering and present a multiphoton generalization of the Kramers-Heisenberg dispersion formula. We shall then apply this general formula to the study of higher-harmonic generation from a short-range potential with a single bound state, and evaluate the rates R, of the n-th-order harmonic for a set of specifically chosen parameters. PACS 32.80.Rm -Multiphoton ionization and excitation to highly excited states (e.g., Rydberg states).

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“…Recently Basile, Trombetta, and Ferrante [5] have sought to improve the approximation of replacing the exact final-state wave function by a "Coulomb-Volkov" state. Then the Coulomb-Volkov state is written as e expi at'…”

Section: Introductionmentioning

confidence: 99%

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

Krstić

Mittleman

1991

Phys. Rev. A

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We present a high-intensity theory of the angular distribution of electrons from multiphoton ionization by an elliptically polarized laser field in which the initial state is described by a dressed atoInic state and the final state by a Coulomb scattering state. The essential approximation is the neglect of the Coulomb interaction compared to the electron-laser interaction in the intermediate state. We find the destruction of "twofold" symmetry, as in a recent experiment, and qualitative agreement with that experiment. Extensive results for various photon numbers, polarization angles, and intensities are presented. We also compare distributions from initial S states with those from initial P states with some surprising results. PACS number(s): 32.80.Rm, 32.80.Wr of the exact Green's function by the Volkov Green's function. In effect, the electron-ion interaction is neglected compared 44 5938

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Twofold Symmetric Angular Distributions in Multiphoton Ionization with Elliptically Polarized Light

Cited by 90 publications

References 8 publications

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

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

A new integral equation for treating high-intensity multiphoton processes

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

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