Physical mechanism of photoemission from the Ag-O-Cs photocathodes and perspectives of its implementation for getting subfemtosecond-range temporal resolution

Eduard L. Nolle; Mikhail Ya. Schelev; Alla N. Khokhlova

doi:10.1117/12.516889

1 August 2003 Physical mechanism of photoemission from the Ag-O-Cs photocathodes and perspectives of its implementation for getting subfemtosecond-range temporal resolution

Eduard L. Nolle, Mikhail Ya. Schelev, Alla N. Khokhlova

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Proceedings Volume 4948, 25th International Congress on High-Speed Photography and Photonics; (2003) https://doi.org/10.1117/12.516889
Event: 25th international Congress on High-Speed photography and Photonics, 2002, Beaune, France

Abstract

Comprehensive studies upon the structure and physical properties of Ag-O-Cs photocathode with the AES and XPES techniques are presented. The photoelectron emission spectrum has been measured in situ on each stage of the photocathode preparation. Similar investigations have been carried out as to nanoparticles of Ag with size several tens of nanometers. Being activated with Cs and O, those particles are located on the thin sapphire film surface. It may be concluded that the photoemission from the Ag-O-Cs photocathodes has the same nature as the photoemission from the nanoparticles of Ag on sapphire, namely it is conditioned by the excitation of surface plasmons with concurrent emission of electrons. It also means that the nanoparticles of Ag activated with Cs and O and investigated in this paper may be conceived as a 2-dimensional photocathode. The external photoemission from Ag-O-Cs photocathodes is of strongly pronouned surface nature, with no process of transportation of electrons towards the surface. In this case the characteristic time during which a light wave is able of exciting plasmons at the nanoparticles of Ag is less than 1 fs, which makes the Ag-O-Cs photocathode most perspective from the viewpoint of getting limiting subfemtosecond-range time resolution.

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Eduard L. Nolle, Mikhail Ya. Schelev, and Alla N. Khokhlova "Physical mechanism of photoemission from the Ag-O-Cs photocathodes and perspectives of its implementation for getting subfemtosecond-range temporal resolution", Proc. SPIE 4948, 25th International Congress on High-Speed Photography and Photonics, (1 August 2003); https://doi.org/10.1117/12.516889

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KEYWORDS

Silver

Cesium

Nanoparticles

Surface plasmons

Photoelectric effect

Annealing

Electrons

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