48-Channel electron detector for photoemission spectroscopy and microscopy

Abstract

Articles you may be interested inNote: Binding energy scale calibration of electron spectrometers for photoelectron spectroscopy using a single sample Rev. Sci. Instrum. 82, 096107 (2011); 10.1063/1.3642659 Experimental setup for low-energy laser-based angle resolved photoemission spectroscopy Rev. Sci. Instrum. 78, 053905 (2007); A new compact 60 kV Mott polarimeter for spin polarized electron spectroscopy Rev.We show that it is possible to use a multichannel electron detector in a zone plate based photoemission spectromicroscopy in a snap shot mode to reduce the total acquisition time for a given counting time by 50% relative to the standard scanning mode while preserving the feature of the spectra. We describe the result of tests performed at Elettra using its microbeam ͑150 nm͒ together with a 48-channel detector designed for the PHOIBOS 100 analyzer optimized for extremely small x-ray sources. We also give a short summary of the technical features of the detector and describe one possible calibration procedure for its use in the snap shot mode. We show initial results from using this device to perform chemical maps of surfaces at a resolution of 150 nm.

Mg and Si dopant incorporation and segregation in GaN

“…This is achieved by refractive focusing of the incoming photon beam by means of a Fresnel zone plate, down to a focal spot size with a diameter of about 150 nm. The emerging photoelectrons are collected at an emission angle of a ¼ 308 with respect to the sample surface, with an acceptance cone width of AE78 using a hemispherical electron energy analyser equipped with a multi-channel detection unit [22]. Spectroscopic images are obtained by scanning the sample across the focused photon beam while the analyser is tuned to a selected emission line of interest.…”

Heating modification of an austenitic steel with high‐nitrogen content

“…When this image is corrected [12] for sample topography (b), the main remaining contrast represents the chemical image. In the transformed zone, Cr is concentrated in the lamellae (bright features), whereas it is uniformly distributed in low concentration in the untransformed (darker) regions.…”

Hydrogen behavior in Al Cr alloys: Synchrotron-based photoelectron microscopy of the rapidly solidified structure

“…The X-ray microprobe of 100 nm diameter was provided by Fresnel zone plate focusing optics [17]. For chemical imaging the sample is raster-scanned across the microprobe collecting the photoelectrons within selected kinetic energy window by a SPECS-PHOIBOS 100 hemispherical electron energy analyzer with a 48-channel detector [18].…”

“…In order to remove the topography artefacts and leave only the quantitative chemical information the image processing procedures, described in Refs. [18,20], were applied. Fig.…”