Helium (γ, 2e) triple differential cross sections at an excess energy of 60 eV

Dawson, C.; Cvejanović, S; Seccombe, D. P.; Reddish, T J; Maulbetsch, F; Huetz, A.; Mazeau, J; Kheifets, Anatoli

doi:10.1088/0953-4075/34/16/104

Cited by 38 publications

(27 citation statements)

References 50 publications

(42 reference statements)

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“…Figure 8 shows TDCS results at 60 eV above threshold for equal energy sharing of the ejected electrons. The experimental results in this case [24] were internormalized but not absolute, so we normalized them to our present results for comparison. The CCC theoretical results for this case are seen to agree with our calculations in shape, but are ∼20 percent smaller in magnitude.…”

Section: One Photon Double Ionizationmentioning

confidence: 99%

Cross sections for short-pulse single and double ionization of helium

2008

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In a previous publication, procedures were proposed for unambiguously extracting amplitudes for single and double ionization from a time-dependent wavepacket by effectively propagating for an infinite time following a radiation pulse. Here we demonstrate the accuracy and utility of those methods for describing two-photon single and one-photon double ionization of helium. In particular it is shown how narrow features corresponding to autoionizing states are easily resolved with these methods.

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Section: One Photon Double Ionizationmentioning

confidence: 99%

Cross sections for short-pulse single and double ionization of helium

2008

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“…Up to now, the fivefold differential cross section of the PDI of helium has been investigated for different energy sharings by many experimental groups. These studies can be loosely grouped in three energy regions: first, near the double ionization threshold, where the electron dynamics can be understood by the Wannier theory [7][8][9]); second, in the middle energy region (E exc = 2-100 eV) where the double ionization is dominated by electron-electron scattering (4DCS are available from [7,8,[10][11][12][13][14][15][16][17][18][19][20][21][22]). And third, for the high-energy region where shake-off plays a major role in the double ionization, only one measurement of the 4DCS at E exc = 450 eV has been reported so far [23].…”

Section: Cos 2 D 12mentioning

confidence: 99%

Photo double ionization of helium 100 eV and 450 eV above threshold: I. Linearly polarized light

Knapp

Kheifets

Bray

et al. 2005

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

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We present a joint experimental and theoretical study for the fully differential cross section of the photo double ionization (PDI) of helium with linearly polarized light at the excess energies E exc = 100 eV and 450 eV above the threshold. The fully differential cross section is obtained by measuring the three-dimensional momentum vectors of one electron and the He 2+ ion in coincidence using the COLTRIMS method. We give an overview of the momentum distribution of the three-body continuum 100 eV above the threshold. We show angular distributions for both electrons for various energy sharings at E exc = 100 eV and 450 eV. The experimental results are well reproduced by a set of convergent close-coupling (CCC) calculations.

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“…Full, dashed, and dotted theoretical curves are defined as in Fig. 3; dot-dashed curves, results of the CCC calculations of Kheifets [56]. The experimental data of Dawson et al [56] [56] and the TDCC calculation of Colgan and Pindzola [45].…”

Section: Fig 5 Tdcs For Double Photoionization Ofmentioning

confidence: 99%

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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Helium (γ, 2e) triple differential cross sections at an excess energy of 60 eV

Cited by 38 publications

References 50 publications

Cross sections for short-pulse single and double ionization of helium

Cross sections for short-pulse single and double ionization of helium

Photo double ionization of helium 100 eV and 450 eV above threshold: I. Linearly polarized light

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

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