EVIDENCE FOR QUANTUM-MECHANICAL INTERFERENCE EFFECTS IN DISSOCIATIVE SCATTERING OF H-2(+) AND N-2(+) FROM CU(111)

Autor(en): RECHTIEN, JH
MIX, W
SNOWDON, KJ
Stichwörter: CHARGE-TRANSFER; Chemistry; Chemistry, Physical; COLLISIONS; DESORPTION; ENERGY; HYDROGEN; ION-SURFACE SCATTERING; METAL-SURFACES; MOLECULAR-IONS; Physics; Physics, Condensed Matter; SKIPPING MOTION; TRANSIENT ADSORPTION
Erscheinungsdatum: 1991
Herausgeber: ELSEVIER SCIENCE BV
Journal: SURFACE SCIENCE
Volumen: 259
Ausgabe: 1-2
Startseite: 26
Seitenende: 44
Zusammenfassung: 
We have measured the neutral particle energy/ nucleus distributions corresponding to the scattering of 1-6 keV H-2(+) and N2+ beams incident at 1-5-degrees to a Cu(111) surface. The atomic part of the distributions exhibit a series of regularly spaced peaks whose relative intensities, but not positions, change with incidence angle, azimuthal angle, and scattering angle. The magnitude of the final velocity of the atoms therefore determines the peak positions. We suggest that the oscillations are quantum mechanical in origin. We suggest an explanation in which the phase difference, accumulated by trajectories on the diabatic potential energy surfaces corresponding to the configurations H-2-Cu and 2 Cu-H following traversal of the crossing seam on the exit half of the scattering trajectory, leads to interference and to the observed oscillatory structure. Assuming perpendicular energy scaling we appear to observe an entrance channel barrier for access of the 2 Cu-H configuration of between 0.3 and 0.6 eV. This is consistent with that inferred from experiments using hyperthermal beams.
ISSN: 00396028
DOI: 10.1016/0039-6028(91)90521-S

Show full item record

Google ScholarTM

Check

Altmetric