Electronic Resource
College Park, Md.
:
American Institute of Physics (AIP)
The Journal of Chemical Physics
115 (2001), S. 9477-9483
ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
Ultraviolet (UV) irradiation (λ〈400 nm) of H2O co-adsorbed with alkali metal atoms (AM=K, Cs) on the graphite (0001) surface at 90 K leads to the formation of a range of desorbing products (H2, CH4, CO, and CO2); and to the formation of oxygen-rich AM–O–C complexes on the surface. The reaction proceeds via hydrated AM complexes [AM–(H2O)n], which represent the main photo-reactive center in the co-adsorption systems. The proposed mechanism is initiated by the formation of hot electron–hole pairs in the substrate under UV irradiation. Attachment of a hot electron to an AM–(H2O)n complex can lead to selective dissociation of the associated water molecules. The resultant release of reactive species (e.g., excited H; OH) initiates a range of branched/chain reactions yielding the observed desorbing species. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1414375
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