Double photoionization of helium at an excess energy of 60 eV using left- and right-elliptically-polarized light

Collins, S. A.; Cvejanović, S; Dawson, C.; Reddish, T J; Seccombe, DP; Huetz, A.; Malegat, L; Selles, P.; Kazansky, A K; Danjo, A; Soejima, K; Okuno, K.; Yagishita, Akira

doi:10.1103/physreva.65.052717

Cited by 20 publications

(26 citation statements)

References 61 publications

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“…However, dynamical zeros for the CD parameter were not found in all studies of the effect. As mentioned above, dynamical zeros were neither predicted by the HRM-SOW theory nor observed experimentally for an excess energy of 60 eV [57].…”

Section: B Nongeometrical Zeros Of the CD Parametersmentioning

confidence: 87%

Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

2004

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We extend application of our lowest-order perturbative approach (in electron-electron correlation) for analysis of photo-double-ionization (PDI) of He [A.Y. Istomin et al., J. Phys. B 35, L543 (2002)] to excess energies up to 450 eV and to analysis of circular dichroism. We find that account of electron correlation in the final state to first order provides predictions for the triply differential cross section and circular dichroism that are in reasonable agreement with absolute data for excess energies up to 80 eV. For an excess energy of 450 eV, account of electron correlation in both initial and final states is necessary and the predicted triply differential cross sections are in agreement with absolute data only for large mutual ejection angles. We find that at excess energies of a few tens of eV, the PDI is dominated by the "virtual" knock-out mechanism, while the "direct" (on-shell) knock-out process gives only small contributions for large mutual ejection angles. As a result, we conclude that the circular dichroism effect at these energies originates from the nonzero electron Coulomb phase shifts.

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Section: B Nongeometrical Zeros Of the CD Parametersmentioning

confidence: 87%

Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

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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“…As a result, a very large set of TDCSs covering a variety of dynamic situations is now available. Most of these TDCSs are relative [1][2][3][4][5][6], some are relative but internormalized [7], and a few are absolute [8][9][10][11]. The first absolute measurements of TDCSs were obtained in 1995 by a direct and self-consistent method [8].…”

Section: Present State Of Theoretical and Experimental Studies Of mentioning

confidence: 99%

“…Thereafter, the TDCC results were compared [20] with relative experimental data of higher statistics recorded for linearly polarized light at 25 eV [4], 40 eV [2,7], and 60 eV [3] excess energies. Similarly, the HRM-SOW calculations were compared with data obtained at 60 eV above threshold for elliptically polarized light [5], at 25 eV above threshold for linearly polarized light [6], and very recently at 40 eV above threshold for linearly polarized light [7,23,24], as well as at 20 eV using elliptically polarized light [25].…”

Section: Present State Of Theoretical and Experimental Studies Of mentioning

confidence: 99%

“…7, namely for pure linearly polarized light, a ratio between the individual electronic energies E 1 / E 2 = 7 and with one electron detected along the polarization axis. For the energy pairs (20,5) and ͑18, 7͒eV, the EE⌬ is dramatically altered when passing from R 0 = 10 to 60 a.u. : its sign changes throughout the angular range considered.…”

Section: Convergence Studies With Respect To R 0 At 20 Evmentioning

confidence: 99%

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Convergence of the method of the hypersphericalRmatrix with semiclassical outgoing waves

et al. 2004

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A systematic study is reported on the convergence of computed triply differential cross sections for photodouble ionization of helium at 20 and 25 eV above threshold, obtained using the hyperspherical R matrix with semiclassical outgoing waves method. Such a study has become feasible due to an essential improvement in the description of the radial correlation coordinate ␣ = arctan͑r 2 / r 1 ͒ at short range, and to the implementation of the code on a more powerful computer. It shows that the size requirements of the inner region R ഛ R 0 , with R = ͱ r 1 2 + r 2 2 , vary considerably depending on the dynamic situation considered. Typically, while R 0 Ӎ 20 a.u. proves sufficient in most circumstances, one has to increase the inner region up to R 0 Ӎ 60 a.u. in order to reach convergence in the triply differential cross sections obtained for very asymmetric energy sharings or in the particular case when one electron is ejected along the electric field for linearly polarized photons. The converged calculations are generally in very good agreement with new experimental data of high statistical quality recorded in the latter case, at 25 eV above threshold, for various energy sharings. The dynamic situations identified here call for further experimental and theoretical studies.

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Double photoionization of helium at an excess energy of 60 eV using left- and right-elliptically-polarized light

Cited by 20 publications

References 61 publications

Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

Perturbative analysis of the triply differential cross section and circular dichroism in photo-double-ionization of He

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Convergence of the method of the hypersphericalRmatrix with semiclassical outgoing waves

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