Probing electron transfer dynamics at MgO surfaces by Mg-atom desorption.
J Phys Chem B
; 110(37): 18093-6, 2006 Sep 21.
Article
em En
| MEDLINE
| ID: mdl-16970417
ABSTRACT
Ultraviolet excitation of high surface area MgO films using 4.7 eV femtosecond pulses results in neutral Mg-atom desorption with hyperthermal kinetic energies in the range 0.1-0.4 eV. The Mg-atom hyperthermal energies and power dependences are similar to those previously observed using nanosecond pulsed excitation. Femtosecond two-pulse correlation measurements reveal the existence of different dynamical paths for Mg-atom desorption. One mechanism displays a sub-150 fs time scale and involves the simultaneous or near-simultaneous transition of two electrons to a 3-coordinated Mg(2+) site. Other paths display picosecond time scales that we associate with dynamics following electron trapping at 3-coordinated Mg(2+) surface sites.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Físico-Química
/
Elétrons
/
Magnésio
/
Óxido de Magnésio
Tipo de estudo:
Prognostic_studies
Idioma:
En
Revista:
J Phys Chem B
Assunto da revista:
QUIMICA
Ano de publicação:
2006
Tipo de documento:
Article
País de afiliação:
Estados Unidos