Intramolecular motion during stimulated surface processes

Ammonia and deuterated ammonia exhibit an anomalously large isotope effect in their relative yields and rotational spinning energy for electron-stimulated desorption from Pt(111). Quantum-resolved desorption measurements and [ital ab] [ital initio], two-dimensional, potential energy calculations sug...

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Bibliographic Details
Published in:Physical review letters 1994-06, Vol.72 (24), p.3895-3898
Main Authors: Burns, AR, Jennison, DR, Stechel, EB, Li, YS
Format: Article
Language:English
Subjects:
665000 - Physics of Condensed Matter- (1992-)
AMMONIA
CHEMICAL REACTIONS
CHEMISORPTION
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
DESORPTION
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY
ENERGY LEVELS
EXCITED STATES
FREE ENERGY
HYDRIDES
HYDROGEN COMPOUNDS
ISOTOPE EFFECTS
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
PHYSICAL PROPERTIES
PLATINUM
PLATINUM METALS
SEPARATION PROCESSES
SORPTION
SURFACE ENERGY
SURFACE PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENTS
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Summary:Ammonia and deuterated ammonia exhibit an anomalously large isotope effect in their relative yields and rotational spinning energy for electron-stimulated desorption from Pt(111). Quantum-resolved desorption measurements and [ital ab] [ital initio], two-dimensional, potential energy calculations suggest that the desorbate undergoes a geometry change (molecular inversion) induced by the excited state. Inverted molecules deexcite to a repulsive hard wall potential and desorb. In general, [ital multidimensional] potential energy surfaces determine the dynamics of stimulated surface processes.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.72.3895