State-resolved dynamics of infrared photodesorption of CO from Ag(111)
Conference
·
OSTI ID:100161
- and others
Current understanding of the dynamics of photon stimulated desorption (PSD) of molecules from surfaces has been derived in large part from state- and energy-resolved probes of the desorbed molecules in the gas-phase. Analogous to studies of gas-phase photodissociation, information concerning the electronic interactions and nuclear motions on the dissociative potential surface are inferred from the energy, internal state and angular distributions of the photoproducts. Of particular interest is the use of state-resolved methods to ellucidate the photodesorption mechanism which can involve substrate and/or absorbate excitations followed by facile energy transfer between the electronic and nuclear degrees of freedom. The primary concern of this work is desorption induced by photon energies well below the work function ({<=}1-2 eV) which is nominally assumed to occur via a thermally activated process. From a dynamical standpoint, laser-induced surface heating results from the rapid thermalization of initially photo- excited electron-hole pairs which relax through inelastic e{sup -} - e{sup -} scattering and energy transfer to lattice modes of the substrate. Desorption results from random surface atom displacements which deposit vibrational energy in the absorbate-metal bond in excess of the binding energy.
- Research Organization:
- Brookhaven National Lab., Upton, NY (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 100161
- Report Number(s):
- BNL--62136; CONF-950793--10; ON: DE95016513
- Country of Publication:
- United States
- Language:
- English
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