Circular dichroism at equal energy sharing in photo-double-ionization of He

Istomin, Andrei Y.; Manakov, N. L.; Meremianin, A. V.; Starace, Anthony F.

doi:10.1103/physreva.70.010702

Cited by 5 publications

(7 citation statements)

References 22 publications

(49 reference statements)

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“…III.A we analyze these cross sections for DPI of He quantitatively (including the lowest-order nondipole corrections to the EDA) by means of two methods: (i) the convergent close-coupling (CCC) theory [20], whose EDA predictions for the TDCS are in excellent agreement with existing experiments for He (see, e.g., Ref. [21]), and (ii) the LOPT, which provides EDA results for the TDCS of reasonable accuracy for low excess energies [22,23] and which has been used recently for analyses of nondipole effects in the TDCS for E exc ≤ 450 eV [6][7][8]). These results thus allow us: (i) to provide reliable CCC predictions for the dipole and nondipole asymmetry parameters (and thus for the magnitude of nondipole effects at particular excess energies), and (ii) to assess the accuracy of the LOPT predictions for these pa-rameters by comparing them to the CCC results.…”

Section: Introductionmentioning

confidence: 72%

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Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

et al. 2005

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Similarly to differential cross sections for one-electron photoionization, the doubly differential cross section for double photoionization ͑DPI͒ may be conveniently described by four parameters: the singly differential ͑with respect to energy sharing͒ cross section ͑ 0 ͒, the dipole asymmetry parameter ͑␤͒, and two nondipole asymmetry parameters ͑␥ and ␦͒. Here we derive two model-independent representations for these parameters for DPI from a 1 S 0 atomic bound state: ͑i͒ in terms of one-dimensional integrals of the polarization-invariant DPI amplitudes and ͑ii͒ in terms of the exact two-electron reduced matrix elements. For DPI of He at excess energies, E exc , of 100 eV, 450 eV, and 1 keV, we present numerical results for the asymmetry parameters within the framework of the convergent close-coupling theory and compare them with results of lowest-order ͑in the interelectron interaction͒ perturbation theory ͑LOPT͒. The results for E exc = 1 keV exhibit a nondipole asymmetry that is large enough to be easily measured experimentally. We find excellent agreement between our LOPT results and other theoretical predictions and experimental data for total cross sections and ratios of double to single ionization cross sections for K-shell DPI from several multielectron atoms.

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Section: Introductionmentioning

confidence: 72%

“…Similar parametrizations for the TDCS that include the lowest-order nondipole corrections were derived in Refs. [6][7][8]. Moreover, in both cases the polarization-invariant amplitudes are expressed in terms of Legendre polynomials and exact two-electron reduced matrix elements.…”

Section: Introductionmentioning

confidence: 99%

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

et al. 2005

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“…[192] At an excess energy as low as 80 eV, a forward-backward asymmetry in the triply differential cross section (TDCS) was confirmed with a linearly polarized light. The case of an elliptically polarized light was discussed in the same year, [193] and they found that for the equal energy sharing, the circular dichroism exists, which is expected to be zero within the dipole approximation. Later, the details of their methods were published, [194] in which the electron's evolution is separately calculated with the ground state correlation and the final state correlation included.…”

Section: Asymmetry In Photoelectron Angular Distributionmentioning

confidence: 99%

Review on non-dipole effects in ionization and harmonic generation of atoms and molecules*

et al. 2020

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In this review, we will focus on recent progress on the investigations of nondipole effects in few-electron atoms and molecules interacting with light fields. We first briefly survey several popular theoretical methods and relevant concepts in strong field and attosecond physics beyond the dipole approximation. Physical phenomena stemming from the breakdown of the dipole approximation are then discussed in various topics, including the radiation pressure and photon-momentum transfer, the atomic stabilization, the dynamic interference, and the high-order harmonic generation. Whenever available, the corresponding experimental observations of these nondipole effects are also introduced respectively in each topics.

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“…Only recently have theoretical analyses of lowest order nondipole effects in the TDCS been reported [7][8][9]. The analytic analyses presented in these works have established the general angular-polarization structure of both the dipole-quadrupole transition amplitude and the TDCS for DPI from the 1 S 0 two-electron bound state.…”

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confidence: 99%

Nondipole effects in double photoionization of He at 450 eV excess energy

Istomin

Starace

Manakov

et al. 2005

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

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During the last decade, single-photon double ionization (DPI) of atoms and molecules has attracted much attention from both experimentalists and theorists. This was stimulated by the advent of VUV radiation sources that produce photons having well-defined polarization as well as by the development of techniques for coincidence measurements. Kinematically complete experiments allow one to gain much insight into the physical mechanisms of DPI by studying the photoelectron angular distributions described by the triply differential cross section (TDCS) [1][2][3]. Until recently, however, all experimental studies of the TDCS for DPI have been interpreted within the electric-dipole approximation (EDA) (see, e.g., recent experimental measurements [4-6] of the TDCS for DPI of He at excess energies of 100 eV and 450 eV with which convergent close-coupling (CCC) EDA predictions have been compared). Only recently have theoretical analyses of lowest order nondipole effects in the TDCS been reported [7][8][9]. The analytic analyses presented in these works have established the general angular-polarization structure of both the dipole-quadrupole transition amplitude and the TDCS for DPI from the 1 S 0 two-electron bound state. The corresponding numerical analyses [7][8][9] have so far employed only a perturbative (in the interelectron interaction) dynamical model of the DPI process, whose gauge-invariant predictions for photon energies of the order of hundreds of eV are reliable only for large mutual ejection angles [8]. Thus, while predicting quite significant nondipole asymmetries in photoelectron angular distributions, the perturbative 0953-4075/06/020035+09$30.00

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Circular dichroism at equal energy sharing in photo-double-ionization of He

Cited by 5 publications

References 22 publications

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

Parametrizations and dynamical analysis of angle-integrated cross sections for double photoionization including nondipole effects

Review on non-dipole effects in ionization and harmonic generation of atoms and molecules*

Nondipole effects in double photoionization of He at 450 eV excess energy

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