Coherence in Grazing Ion-Surface Collisions

Winter, H.; Zimny, R.

doi:10.1007/978-1-4757-9745-9_8

Cited by 21 publications

(3 citation statements)

References 59 publications

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“…The band structure of the target and the atom-metal matrix elements V a;k (z) should be recomputed in the boosted reference frame of the ion. This effect has already been studied within the single-particle picture 15 and it would be worthwhile to include these effects in the many-body model. Local variations in the electrostatic potential due to the adsorbates also should be included in the calculation to permit more quantitative comparisons with experiment.…”

Section: Discussionmentioning

confidence: 99%

“…Attention must also be paid to the dependence of the atom-metal couplings and the effective density of states on the parallel component of the ion velocity. Note that the electronic states in the metal are shifted in momentum in the reference frame of the ion 15 . For now we ignore parallel velocity; the inclusion of this effect will be part of future refinements.…”

Section: The Generalized Newns-anderson Modelmentioning

confidence: 99%

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Many-body theory of charge transfer in hyperthermal atomic scattering

et al. 1993

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We use the Newns-Anderson Hamiltonian to describe many-body electronic processes that occur when hyperthermal alkali atoms scatter off metallic surfaces.Following Brako and Newns, we expand the electronic many-body wavefunction in the number of particle-hole pairs (we keep terms up to and including a single particle-hole pair). We extend their earlier work by including level crossings, excited neutrals and negative ions. The full set of equations of motion are integrated numerically, without further approximations, to obtain the many-body amplitudes as a function of time. The velocity and work-function dependence of final state quantities such as the distribution of ion charges and excited atomic occupancies are compared with experiment. In particular, experiments that scatter alkali ions off clean Cu(001) surfaces in the energy range 5 to 1600 eV constrain the theory quantitatively. The neutralization probability of Na + ions shows a minimum at intermediate velocity in agreement with the theory. This behavior contrasts with that of K + , which shows virtually no neutralization, and with Li + , which exhibits a monotonically increasing neutral fraction with decreasing velocity. Particle-hole excitations are left behind in the metal during a fraction of the collision events; this dissipated energy is predicted to be quite small (on the order of tenths of an electron volt). Indeed, classical trajectory simulations of the surface dynamics account well for the observed energy loss, and thus provide some justification for our truncation of the equations of motion at the single particle-hole pair level. Li + scattering experiments off low work-function surfaces provide qualitative information on the importance of many-body effects. At sufficiently low work function, the negative ions predicted to occur are in fact observed. Excited neutral Li atoms (observed via the optical 2p → 2s transition) also emerge from the collision. A peak in the calculated Li(2p) → Li(2s) photon intensity occurs at intermediate work function in accordance with measurements.

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Section: Discussionmentioning

confidence: 99%

Section: The Generalized Newns-anderson Modelmentioning

confidence: 99%

Many-body theory of charge transfer in hyperthermal atomic scattering

et al. 1993

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“…Winter et al found that only the 2D-state is populated. Similar [8] neutralization experiments have been carried out, for instance on hydrogen, all of them at a large parallel velocity. Although Chas the same states as N, there is only one bound state: 4S.…”

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confidence: 76%

Angular “Selection Rules” for the Resonant Population of O ^- ( ² P ) and C ^- ( ⁴ S ) in Grazing Ion-Surface Collisions

Pinxteren

Heeren

et al. 1989

Europhys. Lett.

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Measurements on the formation of O- and C- by scattering a positive-ion beam from a cesiated (0.6 ML) W(110) surface are presented. The results, 66% of O- and 33% of C-, respectively, in the outgoing beam, are interpreted by means of a strong anisotropy of the transition of electrons between the metal conduction band and the 2p-shell. Symmetry considerations induce that only transitions towards 2p-states with m1 = 0 are possible.

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On the Charge Distribution of Ions after Auger Neutralisation at Surfaces

Taute

Blum

1990

Physica Status Solidi (b)

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Auger neutralisation of Li3+-nuclei moving parallel to a metal surface (Al) is considered. For the case of capture of one electron in the 2porbital of the nuclei the charge distribution of the ions is calculated and interpreted.Es wird Augerneutralisation von Li3 +-Kernen, die sich parallel zu einer Metalloberflache (Al) bewegen, betrachtet. Fur den Fall des Einfangs eines Elektrons in das 2p-Orbital der Kerne wird die Ladungsverteilung der Ionen berechnet und interpretiert.

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Coherence in Grazing Ion-Surface Collisions

Cited by 21 publications

References 59 publications

Many-body theory of charge transfer in hyperthermal atomic scattering

Many-body theory of charge transfer in hyperthermal atomic scattering

Angular “Selection Rules” for the Resonant Population of O ^- ( ² P ) and C ^- ( ⁴ S ) in Grazing Ion-Surface Collisions

On the Charge Distribution of Ions after Auger Neutralisation at Surfaces

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Coherence in Grazing Ion-Surface Collisions

Cited by 21 publications

References 59 publications

Many-body theory of charge transfer in hyperthermal atomic scattering

Many-body theory of charge transfer in hyperthermal atomic scattering

Angular “Selection Rules” for the Resonant Population of O - ( 2 P ) and C - ( 4 S ) in Grazing Ion-Surface Collisions

On the Charge Distribution of Ions after Auger Neutralisation at Surfaces

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Angular “Selection Rules” for the Resonant Population of O ^- ( ² P ) and C ^- ( ⁴ S ) in Grazing Ion-Surface Collisions