Multielectron corrections in molecular high-order harmonic generation for different formulations of the strong-field approximation

Augstein, B. B.; Faria, C. Figueira de Morisson

doi:10.1080/09500340.2011.587612

Cited by 18 publications

(7 citation statements)

References 16 publications

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“…For molecular HHG spectra, the non-spherical Coulomb potential can no longer be ignored. It has been shown that SFA calculations miss several important features in the HHG spectrum [226,227]. The quantitative rescattering theory (QRT) [228] has become a very prominent way to calculate HHG spectra for molecules.…”

Section: C)mentioning

confidence: 99%

Atomic and molecular dynamics triggered by ultrashort light pulses on the atto- to picosecond time scale

Pabst

2013

Eur. Phys. J. Spec. Top.

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Time-resolved investigations of ultrafast electronic and molecular dynamics were not possible until recently. The typical time scale of these processes is in the picosecond to attosecond realm. The tremendous technological progress in recent years made it possible to generate ultrashort pulses, which can be used to trigger, to watch, and to control atomic and molecular motion. This tutorial focuses on experimental and theoretical advances which are used to study the dynamics of electrons and molecules in the presence of ultrashort pulses. In the first part, the rotational dynamics of molecules, which happens on picosecond and femtosecond time scales, is reviewed. Well-aligned molecules are particularly suitable for angle-dependent investigations like x-ray diffraction or strong-field ionization experiments. In the second part, the ionization dynamics of atoms is studied. The characteristic time scale lies, here, in the attosecond to few-femtosecond regime. Although a one-particle picture has been successfully applied to many processes, many-body effects do constantly occur. After a broad overview of the main mechanisms and the most common tools in attosecond physics, examples of many-body dynamics in the attosecond world (e.g., in high-harmonic generation and attosecond transient absorption spectroscopy) are discussed. a

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Section: C)mentioning

confidence: 99%

Atomic and molecular dynamics triggered by ultrashort light pulses on the atto- to picosecond time scale

Pabst

2013

Eur. Phys. J. Spec. Top.

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“…[15] it is recognized that the time differentiation of the SFA wave function is not a proper procedure. Also, for the case of molecules, the structure itself of the harmonic spectrum is different if the acceleration is computed using (4), (3), or (2) [16][17][18]. On the other hand, it is also known that the HHG yields computed from the SFA have to be corrected to approach quantitatively the exact results of the Schrödinger equation.…”

Section: Discussionmentioning

confidence: 99%

Invalidity of the Ehrenfest theorem in the computation of high-order-harmonic generation within the strong-field approximation

Granados

Plaja

2012

Phys. Rev. A

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It is known that the strong-field approximations commonly used in models for computing high-order-harmonic generation invalidate the Ehrenfest theorem. Therefore, the time derivative of the atomic dipole or of the dipole velocity does not correspond to the dipole acceleration. We study the consequences of this invalidation for the quantitative evaluation of high-order-harmonic spectra in hydrogen at different wavelengths and intensities. As a main result, we propose a form for the time derivative of the kinetic momentum that allows a quantitatively accurate computation of the acceleration spectra using the dipole-velocity matrix elements.

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“…In this subsection we want to explore how these conclusions are affected if the electron probability distribution is nonhomogeneous in the sense that it is mainly concentrated at one of the atomic centers. Example of such a molecule is the CO molecule [49,51,52]. We focus our attention to the high-energy part of the spectra.…”

Section: Interference Of the Hati Partial Contributionsmentioning

confidence: 99%

Characteristics of the molecular above-threshold ionization by a bichromatic elliptically polarized field with co-rotating components

Habibović

Gazibegović-Busuladžić

Busuladžić

et al. 2022

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

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We address ionization of a diatomic molecule by a bichromatic elliptically polarized ﬁeld with co-rotating components. Using the strong-ﬁeld approximation we investigate symmetry properties of the photoelectron momentum distribution and explore the minima which appear in the photoelectron spectra. We distinguish two types of minima: (i) two-center interference minima which appear due to the destructive interference of the contributions of two electron wave packets emitted from the two centers of the diatomic molecule and (ii) the one-center minima which are caused by the interference of the parts of the wave packet emitted from the same atomic center at diﬀerent times. The position of the two-center interference minima depends on the molecular orientation. When a molecular orbital is modelled using the atomic orbitals of a speciﬁc parity, the position of the two-center interference minima does not depend on the ellipticity of our driving ﬁeld. However, when a molecular orbital consists of both odd and even atomic orbitals the interference of their contributions and the position of the minima depend on the ellipticity. The position of the interference minima in the photoelectron momentum plane is conﬁrmed using the saddle-point method. The position and the number of the one-center minima do not depend on the molecular orientation, but they strongly depend on the ellipticity of the ﬁeld components. Finally, comparing the photoelectron spectra of the CO molecule with the spectra of homonuclear molecules and the NO molecule we show that the electron probability density distribution plays a signiﬁcant role for the high-energy rescattered electrons.

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Multielectron corrections in molecular high-order harmonic generation for different formulations of the strong-field approximation

Cited by 18 publications

References 16 publications

Atomic and molecular dynamics triggered by ultrashort light pulses on the atto- to picosecond time scale

Atomic and molecular dynamics triggered by ultrashort light pulses on the atto- to picosecond time scale

Invalidity of the Ehrenfest theorem in the computation of high-order-harmonic generation within the strong-field approximation

Characteristics of the molecular above-threshold ionization by a bichromatic elliptically polarized field with co-rotating components

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