Low‐energy (e,2e) spectroscopy

Feder, R.; Gollisch, H.

doi:10.1002/9783527602506.ch9

Cited by 4 publications

(6 citation statements)

References 39 publications

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“…For ferromagnets, the dependence of the (p, ep) intensity on the primary spin differs more fundamentally from that in (e, 2e). While SOC produces an asymmetry in both cases (which for 3d ferromagnets should be comparable to what we presently obtained for Cu), the exchange-induced spin dependence, which is sizeable in (e, 2e) (cf [5,6,8] and references therein), is entirely absent in (p, ep), since positron and electron are distinguishable particles. In principle, dipoledipole interaction between the incident particle and the valence electron may lead to a further spin dependence of (p, ep) and (e, 2e), which should, however, be extremely small.…”

Section: Discussionsupporting

confidence: 83%

“…Since positrons and electrons are distinguishable particles, the pair correlation in positron-induced electronpositron emission (referred to in brief in the following as (p, ep)) is solely due to the Coulomb interaction. This is in contrast to the established technique of electron-induced electron-electron emission (e, 2e) (cf [5][6][7][8][9][10][11] and references therein) in the hitherto used set-ups without spin analysis, in which the pair correlation arises from a combination of the Coulomb interaction and the exchange interaction.…”

Section: Introductionmentioning

confidence: 80%

“…which is formally the same as the expression for the reaction cross section for electron-induced electron pair emission (e, 2e), which has been previously derived and discussed in detail (cf the review article [5] and references therein). In equation ( 1) |1 is a low-energy-positron-diffraction (LEPD) state with quantum numbers set asymptotically by the positron gun.…”

Section: Reaction Cross Sectionmentioning

confidence: 93%

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Positron-induced emission of electron–positron pairs from solid surfaces

Giebels¹,

Gollisch²,

Feder³

2009

J. Phys.: Condens. Matter

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The collision of a low-energy positron, which impinges on a crystalline surface, with a valence electron may result in the emission of a spatially separated time-correlated electron-positron pair. We present a method for calculating the cross section for this positron surface reaction channel, which we briefly refer to as (p, ep) in analogy to electron-induced pair emission (e, 2e). The two-particle final state is represented by a product of an electron and a positron diffraction state coupled by a 'correlation factor', which accounts for the screened Coulomb interaction. The electron-solid and positron-solid quasi-particle potentials are based on first-principles calculations within density functional theory. Numerical (p, ep) results are presented for Cu(111) and compared to their (e, 2e) counterparts. Energy distributions for constant emission angles reflect, to a large extent, the valence electron density of states. In equal-energy (p, ep) angular distributions, the Coulomb interaction produces a central accumulation zone-in contrast to a depletion zone for (e, 2e)-the relative weight and the extension of which are subject to 'matrix element effects'. At larger angles sharp features arise from single-particle surface resonances.

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Section: Discussionsupporting

confidence: 83%

Section: Introductionmentioning

confidence: 80%

Section: Reaction Cross Sectionmentioning

confidence: 93%

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Positron-induced emission of electron–positron pairs from solid surfaces

Giebels¹,

Gollisch²,

Feder³

2009

J. Phys.: Condens. Matter

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“…The interaction of low-energy electrons with solid surface systems (clean and adsorbatecovered surfaces) comprises in particular the so-called (e, 2e) process, which involves a single collision event with a valence electron and the subsequent emission of an electron pair. Over the past half-decade, the energy-and momentum-resolved investigation of these pairs of timecorrelated electrons has significantly advanced both experimentally and theoretically and is now established as a valuable method for studying spin-dependent electron collision dynamics and electronic structure in the topmost atomic layers of surface systems (see [1][2][3][4][5][6][7][8][9] and references therein).…”

Section: Introductionmentioning

confidence: 99%

“…Recently, spin-polarized primary electrons have fruitfully been applied in (e, 2e) spectroscopy from ferromagnetic surfaces [4,[7][8][9]. In order to extract from measured spectra information on the spin-split electronic structure of the target, it is essential to understand in detail the collision dynamics and its exchange-induced spin-dependence (see [8]).…”

Section: Introductionmentioning

confidence: 99%

Selection rules in (e, 2e) spectroscopy from ferromagnetic surfaces

Gollisch¹,

Feder²

2004

J. Phys.: Condens. Matter

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Electron pair emission from ferromagnetic crystalline surfaces, which occurs due to the collision of an incident low-energy electron with a valence electron, is shown to be governed by spatial and spin selection rules. Valence electron states with spatial parts antisymmetric with respect to the reaction plane are not observable for any spin configuration. If there is a spatial symmetry plane normal to the reaction plane, spin-polarized primary electrons selectively probe equal and opposite spin valence electrons. These analytical findings are further elaborated for ferromagnetic cubic (110) surfaces and illustrated by numerical results for Fe(110).

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Spin-Polarized (e,2e) Spectroscopy of Surfaces

Samarin¹,

Artamonov²,

Williams³

2018

Spin-Polarized Two-Electron Spectroscopy of Surfaces

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Low‐energy (e,2e) spectroscopy

Cited by 4 publications

References 39 publications

Positron-induced emission of electron–positron pairs from solid surfaces

Positron-induced emission of electron–positron pairs from solid surfaces

Selection rules in (e, 2e) spectroscopy from ferromagnetic surfaces

Spin-Polarized (e,2e) Spectroscopy of Surfaces

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