Laser-induced modifications of selection rules in the Auger effect

Fiordilino, Emilio; Zangara, Rosalia; Ferrante, G.

doi:10.1103/physreva.38.4369

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…This transformation is equivalent to the phase shift of the laser field by π/ω. The symmetry is not exact, it is broken by energy dependence of the dipole and Auger matrix elements which we omitted in expression (3), but approximately it is preserved as it follows from our exact calculations (see figure 3(a)).…”

Section: Resultsmentioning

confidence: 97%

“…Here Ẽ0 is the Fourier transform of the envelope of the x-ray pulse and is its carrier frequency. In expression (3) we have omitted the dipole and the Auger matrix elements, since they weakly depend on the energy and do not strongly influence the shape of the spectrum. The latter is mainly determined by the sum of the Bessel functions including the interference between them.…”

Section: Resultsmentioning

confidence: 99%

“…The intensity of the sidebands decreased regularly with the number of excess photons. Theoretically this structure was explained on the basis of the strong field approximation [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Sideband structure in angle-resolved electron spectra from laser-assisted Auger decay generated by ultra-short pulses

Kazansky¹,

Кабачник²

2009

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

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A quantum mechanical model for laser-assisted Auger decay based on the numerical solution of a system of non-stationary Schrödinger equations is developed. The model is applied to a particular case of Ne KLL Auger transitions. The effect of an intense laser field on the angle-resolved spectra of Auger electrons generated by ultrashort (subfemtosecond) pulses is investigated. We demonstrate that for energetic Auger electrons the sideband structure, which appears due to interaction of electrons with the strong laser field, does not correspond to the generally accepted picture of regular equidistant peaks separated by the laser photon energy. Moreover, the structure strongly depends on the observation angle. The origin of this phenomenon is discussed, and it is demonstrated that the standard sideband picture appears after integration over all angles. The described structure can provide a useful tool for controlling the phase of the x-ray pulse relative to the laser pulse in laser-assisted Auger emission experiments.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

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Sideband structure in angle-resolved electron spectra from laser-assisted Auger decay generated by ultra-short pulses

Kazansky¹,

Кабачник²

2009

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

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“…The existing theory of the above-described process is far from completeness. In the early papers [4][5][6] the laser-assisted Auger decay (LAAD) was considered using the conventional two-step model of the Auger process, the laser field being taken into account within the strong field approximation. After the first pump-probe attosecond experiments [1,3], several theoretical papers have appeared [7][8][9] in which the laserassisted autoionization and Auger decay induced by ultra-short pulses have been considered either within the strong field approximation, or with a schematic model.…”

Section: Introductionmentioning

confidence: 99%

Time-dependent theory of Auger decay induced by ultra-short pulses in a strong laser field

Kazansky

Sazhina

Кабачник

2009

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

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A quantum mechanical theory of a laser-assisted Auger process in atoms excited by an ultra-short (attosecond) electromagnetic pulse in the field of a few-cycle strong laser pulse is presented. It is based on the non-stationary Schrödinger equation, which describes the photoionization of an inner atomic shell and the decay of the created vacancy, while the Auger electron is treated in the strong field approximation. As an example, the photoionization of the Ne 1s shell with the subsequent KLL Auger transition is considered. The spectra and angular distributions of photoelectrons and Auger electrons are calculated and discussed. The photoelectron spectra show a typical picture of streaking in the laser field. In contrast, the Auger electron spectrum contains sideband structure, which is however, different from the conventional equidistant sideband structure, which had been discussed for longer pulses and smaller Auger electron energies. The predicted sideband structure strongly depends on the delay time between the laser pulse and the x-ray pulse. It is sensitive to the carrier-envelope phase as well. A simplified description of the Auger electron spectra in laser-assisted Auger decay, which gives the sideband structure in close agreement with the results of the exact theory, is suggested.

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“…The effect will be discussed in the following simple model. (It is partly the same as the one used for the description of laser-assisted Auger effect [7]). The total Hamiltonian of the system H =Ho+H) +H2, where hL aser 'h w"…”

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confidence: 99%

Laser-assisted inelastic x-ray scattering as a tool for determination of the length of ultrafast x-ray pulses

1993

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The effect of laser fields of intermediately high intensity on the inelastic scattering of x-ray radiation below an absorption edge is theoretically investigated. The results obtained suggest a frequency-selective method for the measurement of the length of an ultrafast x-ray pulse by measuring the intensity of an inelastically scattered narrow-band fraction of the x-ray pulse at different delays of the probe pulse of an intense laser. PACS number(s): 32.80.Wr, 32.30.Rj, 07.85.+n The recent increasing interest in ultrafast x-ray pulses emitted by laser-produced plasmas [I] makes the determination of the pulse length [2] more and more important.Recently preliminary results of a similar effort were published [3], where the measurement of pulse duration is mainly based on the so-called power shift [4]. It is a problem to obtain a good signal-to-noise ratio with this method [3].As the intense laser field can play an important role in x-ray absorption near but below the absorption edge [5] and in y deexcitation by electronic bridge process [6], it

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Laser-induced modifications of selection rules in the Auger effect

Cited by 8 publications

References 3 publications

Sideband structure in angle-resolved electron spectra from laser-assisted Auger decay generated by ultra-short pulses

Sideband structure in angle-resolved electron spectra from laser-assisted Auger decay generated by ultra-short pulses

Time-dependent theory of Auger decay induced by ultra-short pulses in a strong laser field

Laser-assisted inelastic x-ray scattering as a tool for determination of the length of ultrafast x-ray pulses

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