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

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

doi:10.1016/j.susc.2005.06.045

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

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

Chair of Experimental Physics

Abteilung Physikalische Chemie

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al ₂O₃ 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.

Original language	English
Pages (from-to)	43-48
Number of pages	6
Journal	Surface Science
Volume	593
Issue number	1-3
DOIs	https://doi.org/10.1016/j.susc.2005.06.045
State	Published - 20 Nov 2005

Keywords

Cluster
Photoelectron spectroscopy
Plasmon
Silver
Surface photochemistry

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10.1016/j.susc.2005.06.045

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@article{5bd2d07c0fa349ea9f413cdeb682a3d3,

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

abstract = "Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al 2O3 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.",

keywords = "Cluster, Photoelectron spectroscopy, Plasmon, Silver, Surface photochemistry",

author = "Florian Evers and Christoph Rakete and Kazuo Watanabe and Dietrich Menzel and Freund, \{Hans Joachim\}",

note = "Funding Information: We thank Dr. P. Feulner for helpful suggestions and discussions. We are grateful to Dr. W. Drachsel for technical assistance. We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG, SPP1093) and the Fonds der Chemischen Industrie. ",

year = "2005",

month = nov,

day = "20",

doi = "10.1016/j.susc.2005.06.045",

language = "English",

volume = "593",

pages = "43--48",

journal = "Surface Science",

issn = "0039-6028",

publisher = "Elsevier B.V.",

number = "1-3",

}

TY - JOUR

T1 - Two-photon photoemission from silver nanoparticles on thin alumina films

T2 - Role of plasmon excitation

AU - Evers, Florian

AU - Rakete, Christoph

AU - Watanabe, Kazuo

AU - Menzel, Dietrich

AU - Freund, Hans Joachim

N1 - Funding Information: We thank Dr. P. Feulner for helpful suggestions and discussions. We are grateful to Dr. W. Drachsel for technical assistance. We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft (DFG, SPP1093) and the Fonds der Chemischen Industrie.

PY - 2005/11/20

Y1 - 2005/11/20

N2 - Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al 2O3 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.

AB - Two-photon photoemission (2PPE) from silver nanoparticles on a thin Al 2O3 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.

KW - Cluster

KW - Photoelectron spectroscopy

KW - Plasmon

KW - Silver

KW - Surface photochemistry

UR - https://www.scopus.com/pages/publications/26444598538

U2 - 10.1016/j.susc.2005.06.045

DO - 10.1016/j.susc.2005.06.045

M3 - Article

AN - SCOPUS:26444598538

SN - 0039-6028

VL - 593

SP - 43

EP - 48

JO - Surface Science

JF - Surface Science

IS - 1-3

ER -

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

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Keywords

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