Is XPS Absorption Spectroscopy?
Introduction X-ray Absorption Spectroscopy (XAS) or X-ray Absorption Fine Structure (XAFS) measurements and core-level X-ray Photoelectron Spectroscopy (XPS) or Electron Spectroscopy for Chemical Analysis (ESCA) are two powerful spectroscopic techniques. Both techniques involve the excitation of a core electron.
What is XPS microscopy?
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 …
How does XPS spectroscopy work?
How XPS works. X-rays (photons) are shot onto a sample, and when electrons in the sample absorb enough energy, they are ejected from the sample with a certain kinetic energy. The energy of those ejected electrons is analyzed by a detector and a plot of these energies and relative numbers of electrons is produced.
What is the principal behind XPS analysis?
The basic principle of XPS is the photoelectric effect discovered by Hertz in 1887 [7, 8] and extended to surface analysis by K. Siegbahn and his research group at Uppsala University, Sweden, during the mid-1960s. Siegbahn won the Nobel Prize in Physics in 1981 for his work in XPS and coined the acronym ESCA [9].
Why XPS is a surface sensitive technique?
The peak shape and precise position indicates the chemical state for the element. XPS is a surface sensitive technique because only those electrons generated near the surface escape and are detected. The photoelectrons of interest have relatively low kinetic energy.
What is XPS instrument?
XPS / ESCA PHI XPS instruments provide the ability to obtain spectra with a lateral spatial resolution as small as 7.5 µm. Spatial distribution information can be obtained by scanning the micro focused x-ray beam across the sample surface.
Why is XPS so surface sensitive?
Is XPS destructive?
XPS is a non-destructive technique to measure surface chemistry of solid materials, in particular the chemical composition and electronic state.
Why do we use XPS?
X-ray Photoelectron Spectroscopy (XPS) also known as Electron Spectroscopy for Chemical Analysis (ESCA) is the most widely used surface analysis technique because it can be applied to a broad range of materials and provides valuable quantitative and chemical state information from the surface of the material being …
What is photoelectron spectroscopy used for?
Photoelectron spectroscopy (PES) is an experimental technique used to determine the relative energies of electrons in atoms and molecules.
Why is XPS important?
What are the applications of XPS?
XPS can be used to analyze the surface chemistry of a material after an applied treatment such as fracturing, cutting or scraping. From non-stick cookware coatings to thin-film electronics and bio-active surfaces, XPS is the standard tool for surface material characterization.