Femtosecond electron dynamics at the benzene/Ag(111) interface

Gaffney, Kelly J.; Wong, C.; Liu, S.H.; Miller, A. D.; McNeill, Jason; Harris, Charles B.

doi:10.1016/s0301-0104(99)00312-2

Cited by 47 publications

(57 citation statements)

References 30 publications

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“…50,51,[55][56][57][58][59][60] However, in the case of dielectric spacer layers, the lifetimes of excited states show the dependence on the overlayer thickness distinct from the present results. Thus, for Xe/Ag(111) the decay rates of the n = 2 and n = 3 ISs hybridized with QWSs show an oscillating structure with increasing Xe coverage.…”

Section: Calculated Decay Ratescontrasting

confidence: 91%

“…50,51,[55][56][57][58][59][60] However, the overlayer thickness dependence of the many-body decay rates of the hybrid states is qualitatively different. The smooth increase of γ j e-e with increasing overlayer thickness reported here has to be compared with the oscillating dependence found, e.g., for Xe/Ag(111), Kr/Cu(100), and Xe/Cu(100).…”

Section: Discussionmentioning

confidence: 99%

“…This has been experimentally confirmed in TR-2PPE studies of the ISs at surfaces of rare-gas adlayers on metal surfaces. 50,51,[55][56][57][58][59][60] In these systems, strong quantum size effects on the lifetimes of the ISs have been found and successfully interpreted as due to the hybridization between the ISs and the QWSs localized in the conduction band of the dielectric adlayer. The purpose of the present contribution is to show how the QWSs in metallic Pb overlayers on Cu(111) surfaces are modified close to the vacuum level by the hybridization with the ISs.…”

Section: Introductionmentioning

confidence: 93%

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Quantum-well states with image state character for Pb overlayers on Cu(111)

et al. 2012

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We study theoretically the quantum well states (QWSs) localized in Pb overlayers on Cu(111) surface. Particular emphasis is given to the states with energies close to the vacuum level. Inclusion of the long-range image potential tail into the model potential description of the system allows us to show the effect of hybridization between QWSs and image potential states (ISs). The particle-in-a-box energy sequence characteristic for QWSs evolves into the Rydberg series converging towards the vacuum level. The electron density of the corresponding states is partially moved from inside the metal overlayer into the vacuum. The decay rates due to the inelastic electron-electron scattering decrease with increasing energy, opposite to "conventional" QWSs and similar to the ISs. Many-body and wave packet propagation calculations of the inelastic decay rates are supplemented by simple analysis based on the phase accumulation model and wave-function penetration approximation. This allows an analytical description of the dependence of the QWS/ISs hybridization on different parameters and, in particular, on the overlayer thickness.

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Section: Calculated Decay Ratescontrasting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

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Quantum-well states with image state character for Pb overlayers on Cu(111)

et al. 2012

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“…56). In contrast, the transient electronic states observed for benzene adsorbed on Cu (1 1 1) [291,292] and Ag(1 1 1) [293] are most likely modified image-potential states. For a more detailed discussion, the reader is referred to a recent review article by Zhu [294].…”

Section: Adsorbate Statesmentioning

confidence: 90%

Decay of electronic excitations at metal surfaces

Echenique

Berndt

Chulkov

et al. 2004

Surface Science Reports

438

403

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“…On the femtosecond time scale, relevant processes in the context of semiconductors that have been studied with 2PPE include quantum well formation [6], nuclear motion [7,8], intraband scattering [9], and electron localization [10]. McNeill et al [6] reported the transition of an excited electron at the xenon/Ag(111) interface from populating an image potential state (IPS) to populating a quantum well derived from the bulk xenon conduction band.…”

Section: Two-photon Photoemissionmentioning

confidence: 99%

Two-photon Photoemission of Organic Semiconductor Molecules on Ag(111)

Yang

2008

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Angle-and time-resolved two-photon photoemission (2PPE) was used to study systems of organic semiconductors on Ag(111). The 2PPE studies focused on electronic behavior specific to interfaces and ultrathin films. Electron time dynamics and band dispersions were characterized for ultrathin films of a prototypical n-type planar aromatic hydrocarbon, PTCDA, and representatives from a family of p-type oligothiophenes.In PTCDA, electronic behavior was correlated with film morphology and growth modes.Within a few monolayers of the interface, image potential states and a LUMO+1 state were detected. The degree to which the LUMO+1 state exhibited a band mass less than a free electron mass depended on the crystallinity of the layer. Similarly, image potential states were measured to have free electron-like effective masses on ordered surfaces, and the effective masses increased with disorder within the thin film. Electron lifetimes were correlated with film growth modes, such that the lifetimes of electrons excited into systems created by layer-by-layer, amorphous film growth increased by orders of magnitude by only a few monolayers from the surface. Conversely, the decay dynamics of electrons in Stranski-Krastanov systems were limited by interaction with the exposed wetting layer, which limited the barrier to decay back into the metal.Oligothiophenes including monothiophene, quaterthiophene, and sexithiophene were deposited on Ag(111), and their electronic energy levels and effective masses were studied as a function of oligothiophene length. The energy gap between HOMO and LUMO decreased with increasing chain length, but effective mass was found to depend on domains 2 from high-or low-temperature growth conditions rather than chain length. In addition, the geometry of the molecule on the surface, e.g., tilted or planar, substantially affected the electronic structure.

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Femtosecond electron dynamics at the benzene/Ag(111) interface

Cited by 47 publications

References 30 publications

Quantum-well states with image state character for Pb overlayers on Cu(111)

Quantum-well states with image state character for Pb overlayers on Cu(111)

Decay of electronic excitations at metal surfaces

Two-photon Photoemission of Organic Semiconductor Molecules on Ag(111)

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