Emission of convoy electrons after grazing ion-surface collisions

Winter, H.; Strohmeier, P.; Burgdörfer, Joachim

doi:10.1103/physreva.39.3895

Cited by 51 publications

(11 citation statements)

References 12 publications

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“…The first evidence for broadening of the CEP was found by de Ferraris and Baragiola [3] for scattering of protons at an Al surface. A similar broadening was observed for semiconductor surfaces [4,5]. Concurrently, a shift of the CEP to electron velocities larger than v~w as proposed [6] and independently measured [4] for projectile charges greater than one.…”

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confidence: 74%

Rainbow Scattering of Convoy Electrons near Surfaces

et al. 1994

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We present a microscopic simulation of convoy electron emission in glancing-angle ion-surface scattering which accounts for both dynamic image interactions and multiple scattering. We find that the position and shape of the convoy peak are determined by rainbow scattering of electrons in the dynamically screened field of the ion. The nonclassical contribution to rainbow scattering is estimated using a uniform semiclassical approach. Core polarization is shown to contribute significantly to dynamical screening. Good agreement with experiment is found for Li+-SnTe (001) co11isions. PACS numbers: 79.20.Nc, 34.50.Fa, 79.20.Rf Electron emission in glancing-angle collisions has become a focus of ion-surface interactions. Electron spectra can provide detailed information about the neutralization dynamics of multiply charged ions, the electronic structure of the surface (surface density of states), and the long-ranged image interactions near the surface. From a fundamental point of view, the study of fast electrons emitted in ion-surface interactions provides an important link between atomic physics and condensed matter physics.Two decades ago a cusp-shaped peak was discovered in the spectrum of electrons arising from ion-atom [1] and ion-solid (transmission) collisions [2]. This cusp is

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confidence: 74%

Rainbow Scattering of Convoy Electrons near Surfaces

et al. 1994

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“…They attributed this broadening to a deviation from the Coulombic final-state interaction near the surface due to the DIP. 6 Recently, Hasegawa et al measured the incident-energy dependence of the peak energy for the He + -SnTe system. 7 They calculated the peak energy based on the DIP acceleration model, and obtained results qualitatively consistent with the experiments.…”

mentioning

confidence: 99%

“…CE may be mainly produced by projectiles emerging from the surface, because the outgoing part of the projectile trajectory plays an important role in the CE excitation. 6 These CE should be accelerated by the DIP. The potential is retarded from the projectile by a distance of about 0AVi/ca s , where co s is the surface-plasmon frequency.…”

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confidence: 99%

Excitation of electrons from an Al surface by grazing-angle-incident fast heavy ions

et al. 1990

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Measurements were made, at various emission angles, of energy spectra of electrons from Al induced by grazing-angle-incident ions of N 6+ , Ar l2+ , and Xe 27+ with equal velocities corresponding to 0.98 MeV/amu. A new line which could not be explained by any of the hitherto identified mechanisms was observed at an energy obviously larger than that of an electron with a velocity equal to the projectile. The projectile and emission-angle dependences of the line are consistent with the dynamic-imagepotential acceleration mechanism.

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“…a weak but finite enhancement in the target frame). Of particular importance is a dipole final state interaction which can be used to model the final field in which the electron evolves in singly-charged-ion -surface collisions at small glancing angles [17]. The resulting velocity dependence of the Jost functions for this case is in between the ones for a Coulomb potential and a short-range potential.…”

Section: -Threshold Laws and Post-foil Focusingmentioning

confidence: 99%

“…A large number of experimental studies have been performed which have evidenced marked differences between the results of ion-atom and of ion-solid collisions under transmission conditions such as an enhanced attenuation length for convoy electrons [4-71, an abundant population of Rydberg states with high angular momenta [8-lo], and a high-order multipole content of the convoy electron velocity distribution (11, 121. More recently, these studies have been extended to the emission of convoy electrons in glancing angle surface scattering [13][14][15][16][17]. In this case, a broad convoy peak has been observed which, for highly charged projectiles, is shifted to velocities larger than the projectile velocity due to the final state interaction of the electron with the image of the outgoing heavy ion.…”

Section: -Introductionmentioning

confidence: 98%