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Soft X-ray Emission Spectrometer for SEM and EPMA

EPMA spectrum map of FeB-Fe2B Alloy

SEM - Chemical state mapping of Aluminum in Al matrix (Top) vs. AlB2 inclusions (Bottom) with only a 1eV energy shift in peak position

JEOL has developed an unprecedented new type of wavelength dispersive spectrometer (WDS) that utilizes a variable grating, allowing the efficient and parallel collection of very low energy-rays (so called “soft” X-rays). This new Soft X-ray Emission Spectrometer (SXES) boasts not only high spectral resolution (0.3eV) which allows for the Nitrogen Kα and Titanium Lℓ line to be separated, but also ultra-low energy, low-concentration sensitivity with the capability to detect Li even at low single digit weight percent concentration. An additional, and maybe its strongest asset, is its ability to do chemical state analysis. The spectrometer detects differences between conduction band and valence band electrons when they emit X-rays allowing the distinction between bonding and crystal structure in samples containing the same elements. An example would be differentiating highly ordered pyrolytic graphite vs. diamond, both of which are made only of carbon.

The SXES is available for both FE-SEM and EPMA.

Li Detection: Peak shape in compounds

In metallic Li, a single K-line is detected. In Li-compounds, and additional satellite peak can occur depending on the occupancy of the valence band.

High Energy Resolution Spectral Mapping

The SXES allows for direct observation of the Li-K emission for the first time. It is even capable of mapping the different chemical states within a Li-battery that result from different levels of battery charge. Two different Li-K emission lines can be mapped. The intensity of the lower energy Li-K line corresponds to the degree of charge in the battery and the higher energy Li-K line corresponds to the amount of metallically bonded Li.

Fast Parallel Detection

A newly developed aberration corrected grating system and a high sensitivity X-ray CCD allow the SXES to simultaneously collect a wide energy spectrum.

Chemical State Analysis

With the SXES, chemical state analysis is comparable to that of XPS or EELS. The SXES has an energy resolution of only 0.3 eV, as demonstrated using the Fermi-edge of the Al-L emission of Al metal.

SXES Details

  • Excellent light element detection (suitable for Li)
  • Ideal for chemical shift analysis of light elements – critical for battery research
  • Superb sensitivity - a few 10s of ppm B in steel
  • Energy range (50eV – 210eV)
  • Extreme resolution 0.3eV
  • No moving parts - high stability and reproducibility
  • Part of an integrated analytical system or as a stand-alone detector
  • Easy to use spectral mapping