Coincident two-electron emission from surfaces by low-energy electrons

Gollisch, H.; Meinert, D.; Xiao, Yi; Feder, R.

doi:10.1016/s0038-1098(96)00763-6

Cited by 15 publications

(4 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The probability for the two electrons to be detected with asymptotic momenta k 1 and k 2 is derived from an 0031-9007͞98͞81(16)͞3535(4)$15.00 excitation amplitude, T , that is, to leading order, a sum of direct electron pair excitation amplitude, T ee , and an amplitude, T ec , that involves the scattering of the pair from the crystal potential W ec [10,11] (i.e., atomic units [a.u.] are used throughout)…”

Section: Manifestations Of Electronic Correlations In the Diffractionmentioning

confidence: 99%

Manifestations of Electronic Correlations in the Diffraction of Electron Pairs from Crystals

et al. 1998

View full text Add to dashboard Cite

The energy-sharing spectra of correlated electron pairs ejected from Cu(001) and Fe(110) surfaces reveal characteristic structures associated with diffraction of the pair from the lattice. It is demonstrated theoretically and experimentally that (1) the momentum-space positions of these new features are determined by the change of the center-of-mass wave vector of the pairs as compared to the reciprocal lattice vector, and (2) the relative intensities of the peaks and the shapes of the individual peaks are dependent on the internal correlation of the pairs. Possible pathways for the pair creation are envisaged at various diffracted beams. [S0031-9007(98)07432-8]

show abstract

Section: Manifestations Of Electronic Correlations In the Diffractionmentioning

confidence: 99%

Manifestations of Electronic Correlations in the Diffraction of Electron Pairs from Crystals

et al. 1998

View full text Add to dashboard Cite

show abstract

“…At low primary electron energies (less than a few 100 eV), the short mean free paths necessitate the observation of the electron pair in the reflection mode for solid surfaces. Substantial experimental and theoretical progress was only made fairly recently (see [4][5][6][7][8][9][10][11][12] and references therein).…”

Section: Introductionmentioning

confidence: 99%

Spin-polarized low-energy (e, 2e) spectroscopy of non-magnetic surfaces

Gollisch

Xiao

Scheunemann

et al. 1999

J. Phys.: Condens. Matter

Self Cite

View full text Add to dashboard Cite

For spin-polarized low-energy electrons impinging on non-magnetic crystalline surfaces, the collision with a valence electron and the ensuing emission of an electron pair are treated in a distorted-wave Born approximation formalism with exchange, in which the four relevant quasi-one-electron states are solutions of the Dirac equation. Numerical calculations for W(001), which were carried out in two coplanar geometries with normal and grazing incidence of a primary beam polarized normal to the reaction plane, show that the (e, 2e) cross section changes significantly upon reversal of the polarization. Originating mainly from spin-orbit coupling in the valence electron state, asymmetries of up to 30% occur in conjunction with sizable intensity. The calculated spectra respond sensitively to changes in the surface structure.

show abstract

“…We note here that measurements of asymmetry distributions collected under these conditions do not directly represent the density of states as a function of the binding energy or the momentum density distribution because in the low-energy (e, 2e) reaction the cross-section depends on the Coulomb matrix elements and on the reflectivities of the primary and of the ejected electrons at the surface [15]. On the other hand to obtain a significant scattering cross-section an appreciable density of states in momentum space is necessary [15]. Since we intend to outline the spin-dependent features in electronic structure of the films we compare spin-difference and the asymmetries of the constructed distributions.…”

Section: Resultsmentioning

confidence: 99%