http://www.cnr.it/ontology/cnr/individuo/prodotto/ID240571

Optical layout of a beamline for photoemission microscopy (Articolo in rivista)

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Optical layout of a beamline for photoemission microscopy (Articolo in rivista) (literal)

Anno

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Alternative label

Schmidt, T (Schmidt, T); Slezak, J (Slezak, J); Heun, S (Heun, S); Diaz, J (Diaz, J); Blyth, RR (Blyth, RR); Delaunay, R (Delaunay, R); Cocco, D (Cocco, D); Prince, KC (Prince, KC); Bauer, E (Bauer, E); Coreno, M (Coreno, M) (1999)
Optical layout of a beamline for photoemission microscopy
in Journal of synchrotron radiation
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Schmidt, T (Schmidt, T); Slezak, J (Slezak, J); Heun, S (Heun, S); Diaz, J (Diaz, J); Blyth, RR (Blyth, RR); Delaunay, R (Delaunay, R); Cocco, D (Cocco, D); Prince, KC (Prince, KC); Bauer, E (Bauer, E); Coreno, M (Coreno, M) (literal)

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[ 1 ] Sincrotrone Trieste, Trieste, Italy [ 2 ] Arizona State Univ, Dept Phys & Astron, Tempe, AZ 85287 USA [ 3 ] CNR, Ist Metodol Avanzate Inorgan, I-00016 Rome, Italy (literal)

Titolo

Abstract

An optical layout for performing photoemission microscopy using synchrotron light from the storage ring Elettra is described. The microscope, property of the Technical University of Clausthal, was installed on an existing monochromator and the light is deflected and focused by two toroidal mirrors. A light spot of similar to 30 mu m diameter and a photon energy range from 45 to 160 eV has been achieved. The light illuminates the sample in the microscope at grazing incidence and chemical contrast is observed in photoemission. Apart from the standard photoemission mode of operation with synchrotron radiation, surface NEXAFS spectra from microspot areas can be measured, and an example is shown. Images can also be obtained with variable kinetic energies (and therefore variable surface sensitivity) of the secondary electrons while working in NEXAFS mode. The obliquely incident soft X-rays cause shadows due to topography on the surface, which allows an estimate of the height of features. Three-dimensional islands give rise to Fresnel diffraction and many fringes may be visible. This effect and its consequences for chemical imaging are discussed. (literal)

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