Linear and Circular Dichroism in the Double Photoionization of Helium

Soejima, Kazutaka; Danjo, A; Okuno, K.; Yagishita, Akira

doi:10.1103/physrevlett.83.1546

Cited by 51 publications

(52 citation statements)

References 15 publications

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“…These electron angular distributions have recently been called into question by theoretical results [32,33] and by a cross-check on consistency with well established results for linear polarization [34]. In addition recent experimental data on circular dichroism in He double photoionization by Soejima et al [35] found good agreement with CCC calculations by Kheifets and Bray in contrast to the conclusions drawn in [1]. The present paper resolves this dispute.…”

Section: Introductioncontrasting

confidence: 55%

Photo double ionization of He by circular and linear polarized single-photon absorption

Achler

Mergel

Spielberger

et al. 2001

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

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We have measured absolute fully differential cross sections for photo double ionization of helium by circularly and linearly polarized light 20 eV above threshold. The data have been obtained by measuring in coincidence the momentum vector of the He 2+ ion and one of the electrons, covering 4π solid angle for all particles. We give an overview over the momentum distribution in the three-body continuum and show fivefold differential cross sections. We find a swirl in the electron momentum space for double ionization by circularly polarized light. The present data supersede earlier data from our group (V mergel et al 1998 Phys. Rev. Lett. 80 5301).M This article features multimedia enhancements available from the abstract page in the online journal; see www.iop.org.

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Section: Introductioncontrasting

confidence: 55%

Photo double ionization of He by circular and linear polarized single-photon absorption

Achler

Mergel

Spielberger

et al. 2001

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

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“…Up to now, all theoretical treatments of CD have employed the EDA (Refs. [1,3,4,[6][7][8][9][10][11][12][13]) and their predictions are generally in agreement with experiments [12][13][14][15][16]. Measurement of CD provides a sensitive means for probing two-electron dynamics in PDI, since the photon-helicity-dependent CD term in the TDCS originates from an interference between real and imaginary parts of particular components of the (generally non-Hermitian) PDI amplitude [4,7].…”

supporting

confidence: 61%

“…As has been shown recently [18] (for the case of the quadrupole-induced asymmetry of the TDCS with respect to the direction of a linearly polarized photon beam), retardation effects can modify the TDCS considerably even at relatively small excess energies. Though existing measurements of the CD effect [12][13][14][15][16] do not show any signatures of nondipole effects, this fact is expected because all of them have been performed in the orthogonal geometry (i.e., when the photon wave vector, k, is orthogonal to the detection plane spanned by the vectors p 1 and p 2 ), in which case the lowest-order retardation effects do not contribute to the TDCS [18].…”

mentioning

confidence: 99%

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

et al. 2004

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“…Berakdar and Klar (1992) first pointed out that for circular dichroism to occur it is sufficient that the direction of light propagation and the momentum vectors of the electrons span a tripod of defined handedness. This is the case if the two electrons and the light direction are non coplanar and the two electrons have unequal energy (see Berakdar et al (1993); Berakdar (1998);Berakdar (1999); Berakdar and Klar (2001) for a detailed discussion and experimental results (Viefhaus et al 1996;Kheifets and Bray 1998;Mergel et al 1998;Kheifets et al 1999a;Soejima et al 1999;Achler et al 2001;Collins et al 2002).…”

Section: Double Ionisation Of Atoms: a Brief Summarymentioning

confidence: 99%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular fragmentation. In a unique combination, large solid angles close to π Microccopes -the "bubble chambers of atomic physics" -mark the decisive step forward to investigate many-particle quantum-dynamics occurring when atomic and molecular systems or even surfaces and solids are exposed to time-dependent external electromagnetic fields.The present review concentrates on just these latest technical developments and on at least four new classes of fragmentation experiments that have emerged within about the last five years. First, multi-dimensional images in momentum space brought unprecedented information on the dynamics of single-photon induced fragmentation of fixed-in-space molecules and on their structure. Second, a break-through in the investigation of highintensity short-pulse laser induced fragmentation of atoms and molecules has been achieved by using Reaction Microccopes. Third, for electron and ion-impact, the investigation of twoelectron reactions has matured to a state such that first fully differential cross sections (FDCS) are reported. Forth, comprehensive sets of FDCS for single ionisation of atoms by ion-impact, the most basic atomic fragmentation reaction, brought new insight, a couple of surprises and unexpected challenges to theory at keV to GeV collision energies. In addition, a brief summary on the kinematics is provided at the beginning. Finally, the rich future potential of the method is shortly envisaged.2

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Linear and Circular Dichroism in the Double Photoionization of Helium

Cited by 51 publications

References 15 publications

Photo double ionization of He by circular and linear polarized single-photon absorption

Photo double ionization of He by circular and linear polarized single-photon absorption

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

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

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