INFLUENCE OF SUBSTRATE ELECTRONIC EXCITATION ON ATOMIC TRAJECTORIES AND MOLECULAR DISSOCIATION DYNAMICS IN SURFACE SCATTERING UNDER GLANCING INCIDENCE CONDITIONS

Autor(en): SNOWDON, KJ
HARDER, R
NESBITT, A
MIX, W
GOLICHOWSKI, A
KATO, M
Stichwörter: BEAMS; CU(111) SURFACE; DESORPTION; ENERGY-LOSS; SKIPPING MOTION; Spectroscopy
Erscheinungsdatum: 1993
Herausgeber: ELSEVIER SCIENCE BV
Journal: JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA
Volumen: 64-5
Startseite: 627
Seitenende: 632
Zusammenfassung: 
Large translational energy losses are generally observed when fast atomic or molecular beams (either neutral or ionized) are scattered from crystal surfaces under glancing angles of incidence. At keV beam energies, these losses can be of order 1 eV/Angstrom, or 1 eV/fs of the trajectory in the vicinity of the turning point, and are believed to be dominated by electron-hole pair excitation of the electron-gas. Also, electron translational factors must be considered when describing the projectile-surface interaction at keV beam energies. We propose that the `'hot'' electrons associated with both these effects can influence the particle trajectory, and in the case of molecular projectiles, the dissociation dynamics, by causing quantum mechanical fluctuations in the occupation of projectile resonances lying energetically above the Fermi-level. The magnitude of this influence is estimated for atomic projectiles using a generalization of the time-dependent Anderson-Newns Hamiltonian. The possibility via this mechanism of transient adsorption of the beam while retaining some memory of the initial beam normal energy is discussed.
Beschreibung: 
7th International Conference on Vibration of Surfaces, GENOA, ITALY, JUN 14-17, 1993
ISSN: 03682048
DOI: 10.1016/0368-2048(93)80130-E

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