Extended X-ray emission fine structure of sodium†

Abstract

Sodium X-ray emission spectra of NaCl powder were measured by wavelength-dispersive X-ray fluorescence spectrometry and electron probe microanalysis. The X-ray emission spectra show an oscillating fine structure similar to that of the extended X-ray absorption fine structure (EXAFS). The Fourier transform of the X-ray fluorescence spectrum shows a similar radial distribution of atoms around the sodium. These findings demonstrate that a wavelength-dispersive X-ray emission spectrometer is a powerful tool for analyzing the local structure around a light element in condensed matter, which is still not an easy task with using a third-generation synchrotron radiation facility.

A study of K x‐ray hyper‐satellites and KMM radiative Auger effect (RAE) of the elements 19 ≤ Z ≤ 25 by photon excitation

“…Utrianien et al 11 measured KMM RAE relative intensities for elements with Z ranging from 15 to 22 by electron excitation. Kawai et al 12 -14 pointed out the similarity between the RAE and x-ray absorption fine structure (XAFS), which was demonstrated for various low-Z elements like Na, 15 Mg, 16 -18 Al 13,14,19,20 and Si. 21 -25 Because of this similarity, Kawai et al coined 20 the term extended x-ray emission fine structure (EXEFS) for RAE satellites and this similarity between EXEFS and XAFS has been theoretically proved.…”

Radiative Auger Effect and Extended X-Ray Emission Fine Structure (EXEFS)

“…Kawai et al [10][11][12] suggested the similarity between the radiative Auger spectra and the X-ray absorption fine structure (XAFS). This was demonstrated for various low atomic number elements, such as Na, 13 Mg, [14][15][16] Al, 11,12,17,18 and Si. [19][20][21][22][23] A typical example of the similarity between the radiative Auger spectra and extended X-ray absorption fine structure (EXAFS) is shown in Fig.…”

Radiative auger emission satellites observed by microcalorimeter‐based energy‐dispersive high‐resolution PIXE

“…Since this is now a high counting statistics spectrum, in the case of low energy tails, one can test the hypothesis that they correspond to EXEFS structures as proposed and observed in Ref 4–7 while using high‐resolution spectrometers to study the details in the fluorescence emission spectra of various elements. An attempt to do this, nevertheless leads to different structures associated with each of the RAE transition tails, and as a consequence of that, this hypothesis also seems to fail.…”

“…Radiative auger emission (RAE)2, 3 structures associated with the major lines are clearly seen. The interpretation of these structures is not simple and either double RAE transitions or extended X‐ray emission fine structure (EXEFS)4–7 and/or plasmon satellites,8–11 must be assumed to be present to be possible to properly fit the measured spectra.…”