Transcription of XPS Spectra - casaxps.com
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XPS Spectra - casaxps.com
Copyright 2013 Casa Software Ltd. 1 XPS Spectra The XPS technique is used to investigate the chemistry at the surface of a sample. Figure 1: Schematic of an XPS instrument. The basic mechanism behind an XPS instrument is illustrated in Figure 1. Photons of a specific energy are used to excite the electronic states of atoms below the surface of the sample. Electrons ejected from the surface are energy filtered via a hemispherical analyser (HSA) before the intensity for a defined energy is recorded by a detector. Since core level electrons in solid-state atoms are quantized, the resulting energy Spectra exhibit resonance peaks characteristic of the electronic structure for atoms at the sample surface.
Copyright © 2013 Casa Software Ltd. www.casaxps.com 2 escaping the surface. Without redress, the consequence can be peaks shifted in energy by as much as 150 eV.
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