Elliptic dichroism and angular distribution of electrons in two-photon ionization of atoms

Manakov, N. L.; Maquet, Alfred; Marmo, S. I.; Véniard, Valérie; Ferrante, G.

doi:10.1088/0953-4075/32/15/308

Cited by 40 publications

(43 citation statements)

References 35 publications

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“…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). The analysis of the AD asymmetry in the SFA with inclusion of Coulomb effects is presented in [51].…”

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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“…Generally, CD in strong field single-colour multi-photon absorption by unpolarized target atoms or molecules is strictly zero 22 . However, in two-colour multi-photon ionization experiments CD is predicted to exist both in differential and integral electron yields [23][24][25][26] . Here we confirm this prediction while also demonstrating that this technique allows us to determine the degree of circular polarization of an intense XUV beam with high accuracy.…”

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confidence: 99%

Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

et al. 2014

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Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. Although their number will grow steadily over the coming decade, their complete characterization remains an elusive goal. This represents a significant barrier to their wider adoption and hence to the full realization of their potential in modern photon sciences. Although a great deal of progress has been made on temporal characterization and wavefront measurements at ultrahigh extreme ultraviolet and X-ray intensities, only few, if any progress on accurately measuring other key parameters such as the state of polarization has emerged. Here we show that by combining ultra-short extreme ultraviolet free electron laser pulses from FERMI with near-infrared laser pulses, we can accurately measure the polarization state of a free electron laser beam in an elegant, non-invasive and straightforward manner using circular dichroism.

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“…We recognize immediately that T (0) N and T (1) N do not depend on the helicity of the photon. On the contrary, T (2) N exhibits such an explicit dependence. This dependence is determined by the phase factors e ±2iφq by which T 2 is multiplied in (13).…”

Section: Smentioning

confidence: 85%

“…Theseterms were discussed in considerable detail in our precedingwork 8 . The second term, T (1) N , refers to first orderdressing of the atom in which case one of the N photons exchangedbetween the colliding system and the radiation field is interacting with thebound electron, while the third term T (2) N refers to second orderdressing and here two of the N photons exchanged during thescattering interact with the atomic electron. For an EP field, thesedressing terms are given by…”

Section: Smentioning

confidence: 99%

Elliptic Dichroism in Angular Distributions in Free-Free Transitions in Hydrogen

Cionga

Ehlotzky

Zloh

2001

Atoms, Solids, and Plasmas in Super-Intense Laser Fields

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Elliptic dichroism and angular distribution of electrons in two-photon ionization of atoms

Cited by 40 publications

References 35 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

Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

Elliptic Dichroism in Angular Distributions in Free-Free Transitions in Hydrogen

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