Comparison study of electron correlation in one-photon and two-photon double ionization of helium

Jiang, Wei-Chao; Peng, Liang-You; Xiong, Wei; Gong, Qihuang

doi:10.1103/physreva.88.023410

Cited by 22 publications

(28 citation statements)

References 73 publications

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“…Back-to-back emission now occurs, while side-by-side emission remains prohibited as for the case of equal energy sharing [1,13]. [28]. The dominant relative emission angle 12 thus characterizes the DI process regardless of any conditions imposed on θ 1 .…”

Section: A Triply Differential Cross Sectionsmentioning

confidence: 99%

“…Comprehensive numerical studies on the DI of helium following the absorption of a few XUV photons were carried out by Parker et al [16] starting 15 years ago. Following the 2005 experiment of Hasegawa et al [7], two-photon DI of helium has been the subject of several theoretical studies [15,[17][18][19][20][21][22][23][24][25][26][27][28]. In particular, Zhang et al [26] calculated joint angular distributions (JADs) for two-photon DI by XUV pulses in both the nonsequential (39.5 eV < ω XUV < 54.4 eV) and the sequential ( ω XUV > 54.4 eV) regimes for different energy sharings of the emitted electrons.…”

Section: Introductionmentioning

confidence: 99%

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Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions

Liu

Thumm

2015

Phys. Rev. A

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By numerically solving the time-dependent Schrödinger equation in full dimensionality, we discuss the dependance of joint photoelectron angular distributions on the energy sharing of the emitted electrons for the double ionization of helium atoms by ultrashort pulses of extreme ultraviolet (XUV) radiation in coplanar emission geometry with and without the presence of a comparatively weak infrared (IR) laser pulse. For IR-laser-assisted single-XUV-photon double ionization, our joint angular distributions show that the IR-laser field enhances back-to-back electron emission and induces a characteristic splitting in the angular distribution for electrons that are emitted symmetrically relative to the identical linear polarization directions of the XUV and IR pulse. These IR-pulse-induced changes in photoelectron angular distributions are (i) imposed by different symmetry constraints for XUV-pulse-only and laser-assisted XUV double ionization, (ii) robust over a large range of energy sharings between the emitted electrons, and (iii) consistent with the transfer of discrete IR-photon momenta to both photoelectrons from the assisting IR-laser field. While selection-rule forbidden at equal energy sharing, for increasingly unequal energy sharing we find back-to-back emission to become more likely and to compete with symmetric emission.

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Section: A Triply Differential Cross Sectionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions

Liu

Thumm

2015

Phys. Rev. A

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“…Subdivision of the numerical intervals for the radial coordinates r 1 and r 2 into smaller "finite" elements translates the Hamiltonian (2) into a large sparse matrix that can be efficiently diagonalized. The FE-DVR method is well established for solving the radial two-electron TDSE and details for its implementation can be found in the literature [16,21,22,24,26].…”

Section: -2mentioning

confidence: 99%

“…Bräuning et al [3] measured absolute triply differential cross sections for photo-DI of helium covering the full range of possible energy sharing and emission angles of the two photoelectrons. We note that the references addressed in this work constitute a small and not representative part of the very large number of investigations on the DI of helium atoms and refer the reader to more comprehensive reviews for single-photon [20,23,24] and two-photon [9,11,12,16,24] DI, and references therein.…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted XUV few-photon double ionization of helium: Joint angular distributions

Liu

Thumm

2014

Phys. Rev. A

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We investigate few-photon extreme ultraviolet (XUV) double ionization of helium atoms without and in the presence of an assisting infrared (IR) laser field by numerically solving the time-dependent Schrödinger equation in full dimensionality within a finite-element discrete-variable-representation scheme. We discuss joint energy distributions for coplanar emission where the emitted electron momenta and polarization axis of the linearly polarized XUV and IR pulses lie in a plane. Our analysis focuses on joint angular distributions for highly correlated equal-energy-sharing double ionization by absorption of one, two, or three XUV photons and IR-laser-assisted single-photon XUV double ionization.

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“…The key role played by electron correlation in two-photon double ionization of He has subsequently been extensively investigated (see, e.g., Refs. [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]). All these investigations concern the case of linearly polarized XUV pulses.…”

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confidence: 99%

Nonlinear Dichroism in Back-to-Back Double Ionization of He by an Intense Elliptically Polarized Few-Cycle Extreme Ultraviolet Pulse

et al. 2014

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Comparison study of electron correlation in one-photon and two-photon double ionization of helium

Cited by 22 publications

References 73 publications

Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions

Laser-assisted XUV double ionization of helium: Energy-sharing dependence of joint angular distributions

Laser-assisted XUV few-photon double ionization of helium: Joint angular distributions

Nonlinear Dichroism in Back-to-Back Double Ionization of He by an Intense Elliptically Polarized Few-Cycle Extreme Ultraviolet Pulse

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