Publication

VUV-induced radiation ageing processes in CsI photocathodes studied by microscopy and spectroscopy techniques

2009
Journal Articles

Abstract

CsI thin film photocathodes of 600 nm thickness deposited on polished Al surfaces by resistive evaporation technique were studied by angle-resolved X-ray photoelectron spectroscopy (ARXPS), before and after UV-irradiation under vacuum. It is shown that the "UV-irradiated" sample keeps the stoichiometric ratio Cs:1 unchanged (1:1) while it shows a higher concentration of carbon in comparison with "as-deposited" samples. The morphology of the "as-deposited" sample is strongly affected after VUV-irradiation. The consequence of such effects on the physical and chemical properties of the "as-deposited" and "UV-irradiated" CsI thin film photocathodes is discussed. (C) 2009 Elsevier B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/00a19f7e-da25-49b6-87e7-0d9a0147b89a

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2009
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/00a19f7e-da25-49b6-87e7-0d9a0147b89a

About this result

Related concepts (32)

X-ray photoelectron spectroscopy

X-ray photoelectron spectroscopy (XPS) is a surface-sensitive quantitative spectroscopic technique based on the photoelectric effect that can identify the elements that exist within a material (elemental composition) or are covering its surface, as well as their chemical state, and the overall electronic structure and density of the electronic states in the material. XPS is a powerful measurement technique because it not only shows what elements are present, but also what other elements they are bonded to.

Spectroscopy

Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter waves and acoustic waves can also be considered forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory (LIGO).

Photoemission spectroscopy

Photoemission spectroscopy (PES), also known as photoelectron spectroscopy, refers to energy measurement of electrons emitted from solids, gases or liquids by the photoelectric effect, in order to determine the binding energies of electrons in the substance. The term refers to various techniques, depending on whether the ionization energy is provided by X-ray, XUV or UV photons. Regardless of the incident photon beam, however, all photoelectron spectroscopy revolves around the general theme of surface analysis by measuring the ejected electrons.

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VUV-induced radiation ageing processes in CsI photocathodes studied by microscopy and spectroscopy techniques

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