Rainbow scattering under axial surface channeling from a KCl(001) surface

Abstract

Fast He, Ne, Ar, and N atoms with projectile energies from 1 up to 60 keV are scattered under grazing polar angles of incidence from a flat and clean KCl(001) surface. For the scattering along low-index directions (axial surface channeling) we observe pronounced peaks in the angular distributions of scattered projectiles which can be attributed to rainbow scattering. From classical trajectory calculations based on universal and individual pair as well as density functional theory (DFT) potentials, we obtained corresponding rainbow angles for comparison with the experimental data. Fair agreement was found for DFT and individual pair potentials calculated from Hartree-Fock wave functions.

Quantitative structure determination using grazing scattering of fast atoms: Oxygen-induced missing-row reconstruction of Mo(112)

“…For these cases, four different pathways from two separated channels with different corrugation within the unit cell contribute to the scattering amplitude which also results in two different rainbow angles [20,33,42,44]. We note that also for one broad single axial channel, more than two pathways are possible due to multiple scattering for a closer approach to the surface mainly at higher normal energies [33,82]. In Figs.…”

Scattering of H(D) from LiF(100) under fast grazing incidence conditions: To what extent is classical dynamics a useful tool?

“…But one year later, first diffraction measurements from a metal surface were published [15]. Since then, grazing incidence experiments have been performed in a wide diversity of systems: He, Ne, Ar, N/KCl(0 0 1) [16]; He/Ni(1 1 0) [17]; He, Ar/Al(1 1 1) [18]; He, H 2 /Mo(1 1 2) [19]; He/Ag(1 1 0) [20]; He/monolayer of silica in Mo(1 1 2) [21]; He/c(2 Â 2) reconstructed ZnSe(0 0 1) [22]; He, H 2 /c(2 Â 2) S-Fe(1 1 0) and He, H 2 /c(1 Â 3) O-Fe(1 1 0) [23]; He/c(2 Â 4) O-Mo(1 1 2) [24]; H/Al 2 O 3 (1 1 2 0) [25]; H, He/MgO(0 0 1) [26]. However, diffraction of H and, in particular, He atoms from LiF(1 0 0) is still the most studied system [27][28][29][30][31][32].…”

“…For example, Ruiz et al [34,35] have studied the momentum and the energy transfer between the intramolecular degrees of freedom (DOF's) in the quasiresonance region, using classical trajectory calculations and a diatom-rigid surface collision model. Classical trajectory calculations have also been used to study classical rainbow angles [16]. In this latter study, Hartree-Fock based pair potentials were employed.…”

Anomalous KCl(001) Surface Corrugation from Fast He Diffraction at Very Grazing Incidence

“…The residual discrepancy between the intrinsic and the experimental corrugations remains nevertheless intriguing, leading us to address the rainbow angle [32], a bright peak in the intrachannel contribution at maximal angular deflection [6,14,15,32]. The rainbow angle shows a wellknown high sensitivity to the projectile-surface interaction.…”