What does Xanes measure?
Operando X-ray Absorption Near Edge Spectroscopy (XANES) is an analytical technique used to elucidate the local electronic structure of an atom as it evolves throughout a reaction or electrochemical process.
What is K-edge and L edge?
The edges are, in part, named by which core electron is excited: the principal quantum numbers n = 1, 2, and 3, correspond to the K-, L-, and M-edges, respectively. For instance, excitation of a 1s electron occurs at the K-edge, while excitation of a 2s or 2p electron occurs at an L-edge (Figure 1).
What is K edge Xanes?
K-edge. L-edges. An edge results when a core electron absorbs energy equal to or greater than its binding energy. Edges are labeled according to the shell the core electron originates from. XAS is an element specific technique.
What is white line intensity?
An increase in the white line intensity of a nanoparticle XANES vs XANES of bulk standard is usually attributed to partial oxidation due to high surface area and alloying effects. Therefore, an increase in the white line intensity would indicate reduction in the d band population due to PtRu alloying.
What is K-edge CT?
The K-absorption edge (K-edge) refers to the abrupt increase in the photoelectric absorption of x-ray photons observed at an energy level just beyond the binding energy of the k-shell electrons of the absorbing atom. K-shell binding energies are specific to each element.
What causes K-edge?
In X-ray absorption spectroscopy, the K-edge is a sudden increase in x-ray absorption occurring when the energy of the X-rays is just above the binding energy of the innermost electron shell of the atoms interacting with the photons.
What is l3 edge?
The peak at lower energy (~930 eV) has the greatest intensity and is called the L3-edge, while the peak at higher energy (~950 eV) has less intensity and is called the L2-edge.
Where is XANES located in the absorption spectrum?
•XANES is region of x-ray absorption spectrum within ~50eV of the absorption edge. APS XAFS School, Aug 4-8, 2008 © 2008 UOP LLC All Rights Reserved Page 4
Where did the term XANES get its name?
The acronym XANES was first used in 1980 during interpretation of multiple scattering resonances spectra measured at the Stanford Synchrotron Radiation Laboratory (SSRL) by A. Bianconi.
When did Antonio Bianconi come up with the name XANES?
XANES name was invented in 1980 by Antonio Bianconi to indicate strong absorption peaks in X-ray absorption spectra in condensed matter due to multiple scattering resonances above the ionization energy.