Two-photon photoemission from silver nanoparticles on thin alumina films: Role 
of plasmon excitation

Evers, Florian; Rakete, Christoph; Watanabe, Kazuo; Menzel, Dietrich; Freund, Hans-Joachim

doi:10.1016/j.susc.2005.06.045

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Two-photon photoemission from silver nanoparticles on thin alumina films: Role of plasmon excitation

Evers, F., Rakete, C., Watanabe, K., Menzel, D., & Freund, H.-J. (2005). Two-photon photoemission from silver nanoparticles on thin alumina films: Role of plasmon excitation. Surface Science, 593(1-3), 43-48. doi:10.1016/j.susc.2005.06.045.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-06FD-1 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-FAFB-7

Genre: Journal Article

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Creators:
Evers, Florian¹, Author
Rakete, Christoph¹, Author
Watanabe, Kazuo¹, Author
Menzel, Dietrich¹, Author
Freund, Hans-Joachim¹, Author

Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022

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Free keywords: Surface photochemistry; Photoelectron spectroscopy; Plasmon; Silver; Cluster

Abstract: Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al2O3 film on NiAl(1 1 0) has been investigated using femtosecond lasers. The 2PPE spectra show a feature similar to the surface state of Ag(1 1 1). The total 2PPE yield possesses a maximum at about 3.6 eV which corresponds to the surface plasmon resonance of the silver particles. For particle sizes of about 10 nm an enhancement by a factor 450 compared to Ag(1 1 1) is found. Up to this diameter the photoemission yield increases but levels off for larger sizes due to interactions between the particles. It is inferred that the 2PPE process is a direct transition via a virtual state, and that the enhanced 2PPE yield results from the enhancement of the electromagnetic field at the surface of nanoparticles.

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Language(s): eng - English

Dates: Date issued: 2005-11-20

Publication Status: Issued

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Rev. Type: Peer

Identifiers: eDoc: 246792
DOI: 10.1016/j.susc.2005.06.045

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Title: Surface Science

Alternative Title : Surf. Sci.

Source Genre: Journal

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Pages: - Volume / Issue: 593 (1-3) Sequence Number: - Start / End Page: 43 - 48 Identifier: -