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Effective decrease of photoelectric emission threshold from gold plated surfaces

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Title: Effective decrease of photoelectric emission threshold from gold plated surfaces
Authors: Wass, PJ
Hollington, D
Sumner, TJ
Yang, F
Pfeil, M
Item Type: Journal Article
Abstract: Many applications require charge neutralization of isolated test bodies, and this has been successfully done using photoelectric emission from surfaces which are electrically benign (gold) or superconducting (niobium). Gold surfaces nominally have a high work function (∼5.1 eV) which should require deep UV photons for photoemission. In practice, it has been found that it can be achieved with somewhat lower energy photons with indicative work functions of (4.1–4.3 eV). A detailed working understanding of the process is lacking, and this work reports on a study of the photoelectric emission properties of 4.6 × 4.6 cm2 gold plated surfaces, representative of those used in typical satellite applications with a film thickness of 800 nm, and measured surface roughnesses between 7 and 340 nm. Various UV sources with photon energies from 4.8 to 6.2 eV and power outputs from 1 nW to 1000 nW illuminated ∼0.3 cm2 of the central surface region at angles of incidence from 0° to 60°. Final extrinsic quantum yields in the range 10 ppm–44 ppm were reliably obtained during 8 campaigns, covering a period of ∼3 years but with intermediate long-term variations lasting several weeks and, in some cases, bake-out procedures at up to 200 °C. Experimental results were obtained in a vacuum system with a baseline pressure of ∼10−7 mbar at room temperature. A working model, designed to allow accurate simulation of any experimental configuration, is proposed.
Issue Date: 1-Jun-2019
Date of Acceptance: 30-May-2019
URI: http://hdl.handle.net/10044/1/72263
DOI: https://dx.doi.org/10.1063/1.5088135
ISSN: 0034-6748
Publisher: AIP Publishing
Journal / Book Title: Review of Scientific Instruments
Volume: 90
Issue: 6
Copyright Statement: © 2019 The Author(s). Published under license by AIP Publishing.
Keywords: Science & Technology
Technology
Physical Sciences
Instruments & Instrumentation
Physics, Applied
Physics
WATER
PHOTOEMISSION
SYSTEM
Science & Technology
Technology
Physical Sciences
Instruments & Instrumentation
Physics, Applied
Physics
WATER
PHOTOEMISSION
SYSTEM
Applied Physics
09 Engineering
02 Physical Sciences
03 Chemical Sciences
Publication Status: Published
Open Access location: https://arxiv.org/pdf/1901.01057.pdf
Article Number: ARTN 064501
Online Publication Date: 2019-06-24
Appears in Collections:Physics
High Energy Physics



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