Two-photon ionization of the Ar atom and detachment of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">F</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="normal">−</mml:mi></mml:mrow></mml:msup></mml:mrow></mml:math>ion

Pan, Cheng; Gao, Bo; Starace, Anthony F.

doi:10.1103/physreva.41.6271

Cited by 39 publications

(62 citation statements)

References 59 publications

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“…Unlike the adiabatic case (ω 1), for a finite frequency the interval of applicability of the asymptotic form (94) depends on ω: as ω increases, the result (94) becomes applicable at stronger fields. Namely, for ω = 1.5 (when the parameters k and F cr in (94) are F cr = 0.84, k = 0.13 for l = 0, and F cr = 0.89, k = 0.1165 for l = 1) the linear in F regime is realized with an accuracy of about 5% over the interval 2.5 < F < 10.…”

Section: Comparisons With Numerical Resultsmentioning

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: Comparisons With Numerical Resultsmentioning

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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“…For details, see Refs. [20,21]. Figure 2 shows the generalized two-photon total cross section, σ [cf.…”

Section: A Intermediate-state Potential Barrier Effectsmentioning

confidence: 99%

Potential barrier effects in two-photon ionization processes

Starace

2010

Phys. Rev. A

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Potential barriers in the effective radial potential experienced by a photoexcited electron are shown to result in dramatic, resonancelike effects in two-photon ionization processes. In a two-photon ionization process, such potential barriers may affect not only the final state of the electron (as in ordinary photoionization), but also the intermediate-state electron wave packet corresponding to the absorption of one photon. We illustrate these effects for the generalized two-photon cross sections for ionization of Ar and Xe within a single-active-electron, central-potential model.

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“…(A2) agrees with those in Refs. [31,32]. Note that our results for three-photon ionization of atomic hydrogen in its ground state (cf.…”

Section: Appendix: Angular Integralsmentioning

confidence: 91%

“…[19][20][21]), but it remains to be determined to what extent that understanding applies to nonlinear processes such as multiphoton ionization. For atoms larger than He, a number of theoretical treatments of few-photon ionization processes including electron correlation effects have been carried out [22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38], primarily for valence-shell electrons and for photon energies in the UV regime. However, in the EUV and x-ray regimes, multiphoton ionization of innershell electrons becomes possible and the number of allowed ionization channels becomes so large as to make ab initio treatment of all electron correlation effects difficult.…”

Section: Introductionmentioning

confidence: 99%

Potential-barrier effects in three-photon-ionization processes

Starace

2014

Phys. Rev. A

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Resonance-like enhancements of generalized three-photon cross sections for extreme ultraviolet ionization of Ar, Kr, and Xe are demonstrated and analyzed within a single-active-electron, central-potential model. The resonant-like behavior is shown to originate from the potential barriers experienced by intermediate-and final-state photoelectron wave packets corresponding to absorption of one, two, or three photons. The resonance-like profiles in the generalized three-photon-ionization cross sections are shown to be similar to those found in the generalized two-photon-ionization cross sections [Phys. Rev. A 82, 053414 (2010)]. The complexity of Cooper minima in multiphoton-ionization processes is also discussed. Owing to the similar resonance-like profiles found in both two-and three-photon generalized cross sections, we expect such potential-barrier effects to be general features of multiphoton-ionization processes in most atoms with occupied p and d subshells.

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Two-photon ionization of the Ar atom and detachment of theF−ion

Cited by 39 publications

References 59 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

Potential barrier effects in two-photon ionization processes

Potential-barrier effects in three-photon-ionization processes

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