Experimental observation of initial-state effects in photo-double-ionization of Ne<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>s</mml:mi></mml:mrow></mml:math>

Bolognesi, P.; Flammini, R.; Kheifets, Anatoli; Bray, Igor; Avaldi, L.

doi:10.1103/physreva.70.062715

Cited by 9 publications

(11 citation statements)

References 45 publications

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“…The TDCSs of the He 2+ (1s −2 ) and Ne 2+ (2s −2 ) states have been measured at the same excess energy with respect to their relative threshold under unequal energy sharing conditions. As already found in an analogous study under equal energy sharing conditions [14], despite that the two cases share the same initial and final state symmetries some qualitative differences are observed in the TDCS. However, at variance with the equal energy sharing case the differences cannot be explained only as an initial state effect.…”

Section: Discussionsupporting

confidence: 76%

Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Bolognesi

Kheifets

Otranto

et al. 2006

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

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The triple differential cross section (TDCS) of the He 2+ (1s −2 ) and Ne 2+ (2s −2 ) states has been studied under unequal energy sharing conditions and perpendicular geometry, for a ratio of about 3 between the energies of the two ejected electrons. The dynamical quantities which govern the photodouble ionization (PDI) process, i.e. the squared moduli of the gerade and ungerade complex amplitudes and the cosine of their relative phase, have been extracted from the experimental data. The results from the two targets have been compared between themselves as well as with the theoretical predictions of the SC3 and convergent close coupling (CCC) calculations. This work represents a joint experimental and theoretical approach to the investigation of PDI of atomic systems with more than two electrons.

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Section: Discussionsupporting

confidence: 76%

Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Bolognesi

Kheifets

Otranto

et al. 2006

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

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“…It manifests itself in a non-Gaussian amplitude. A small non-Gaussian wing, with a minor contribution to the TDCS, was previously observed in DPI measurements on Ne 2s [32] and attributed to intershell (2s, 2p) mixing in the initial state. At variance in the present measurements an extended wing, which provides a dominant contribution to the TDCS, is observed.…”

mentioning

confidence: 81%

Signature of Two-Electron Interference in Angular Resolved Double Photoionization of Mg

et al. 2013

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The double photoionization of Mg has been studied experimentally and theoretically in a kinematic where the two photoelectrons equally share the excess energy. The observation of a symmetrized gerade amplitude, which strongly deviates from the Gaussian ansatz, is explained by a two-electron interference predicted theoretically, but never before observed experimentally. Similar to the Cooper minima in the single photoionization cross section, the effect finds its origin in the radial extent and oscillation of the target wave function. DOI: 10.1103/PhysRevLett.110.083001 PACS numbers: 32.80.Fb The effect of the target orbital on the photoionization cross section in the form of the Cooper minimum has long been established [1] and commonly used to obtain information on the electronic structure in the gas phase [2] as well as in condensed matter [3,4]. The Cooper minimum, observed for all the orbitals with a number of nodes n À ' À 1 > 0, is determined by the vanishing radial overlap between the photoelectron wave function and the target orbital. Generally there are the two photoionization channels with photoelectron angular momenta ' AE 1, the node in the stronger channel is offset by a nonvanishing contribution in the weaker channel. The situation is much more complicated in double photoionization (DPI) where there are no simple bounds on the individual photoelectron angular momenta ' 1 and ' 2 other than coupling to the total angular momentum of the pair, and a large number of radial integrals contribute to the total integrated photoionization cross section. Hence, there is no simple analogue of the Cooper minimum in DPI.Nevertheless, a strong effect of the target electronic structure was observed in calculations of the angular correlation pattern in the two-electron continuum [5]. It has been shown that (i) for a given symmetry of the electron pair the angular correlation of DPI mimics the angular distribution of an e-impact ionization of the corresponding ion and (ii) the amplitudes of these processes are strongly determined by the radial extent and oscillations of the target orbital of the singly charged ion. In the case of the Cooper minimum, the contributions of the positive and negative oscillations of the target orbital cancel each other in the real and scalar quantity (the dipole radial integral). In the case of DPI, these contributions add up as complex and angular dependent amplitudes. They do not vanish entirely, but display an intricate interference pattern.For a long time, investigation of DPI was focused on the He atom, the simplest two-electron system [6][7][8]. Because of a nodeless 1s target orbital, the dynamic DPI amplitude of this process (also known as correlation factor [9]) showed a very simple Gaussian shape. Alkaline-earth-metal atoms (Be, Mg, Ca, Sr) are ''quasi-two-electron'' systems with the outermost orbitals characterized by one or more nodes and represent the most suitable candidates for extending the investigation of DPI beyond He. The theoretical DPI cross section of Be and hea...

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“…This is reflected in a large variety of patterns for the coincidence angular distributions. Moreover, it has been shown that the angular correlation patterns reveal effects due to the target initial state (Schaphorst et al 1995a, Bolognesi et al 2004b. Finally PDI may also proceed via an indirect process.…”

Section: Heavier Rare Gasesmentioning

confidence: 99%

Photodouble ionization and the dynamics of electron pairs in the continuum

Avaldi

Huetz

2005

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

116

107

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The study of the emission of two electrons from an atom by absorption of a single energetic photon has become of much current interest because it provides the most detailed information on the interaction of the electrons between themselves. Its investigation in the simplest two-electron system, the He atom, in the last ten years has challenged experimentalists and theorists alike. By using selected examples from electron–electron and electron–recoil ion coincidence experiments the main achievements in the field are reviewed. It is shown that the dynamics of the electron pair is strongly constrained by its own symmetry and the Coulomb repulsion. The further aspects brought in by the experiments in diatomic molecules (H2, HD and D2) as well as in the heavier rare gases are also illustrated. Future perspectives which involve other processes which result in an electron pair in the continuum are considered.

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Experimental observation of initial-state effects in photo-double-ionization of Ne2s

Cited by 9 publications

References 45 publications

Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Signature of Two-Electron Interference in Angular Resolved Double Photoionization of Mg

Photodouble ionization and the dynamics of electron pairs in the continuum

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Experimental observation of initial-state effects in photo-double-ionization of Ne2s

Cited by 9 publications

References 45 publications

Photodouble ionization studies of the Ne(2s2) state under unequal energy sharing conditions

Photodouble ionization studies of the Ne(2s2) state under unequal energy sharing conditions

Signature of Two-Electron Interference in Angular Resolved Double Photoionization of Mg

Photodouble ionization and the dynamics of electron pairs in the continuum

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Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions

Photodouble ionization studies of the Ne(2s²) state under unequal energy sharing conditions