Total electron yield mode for XANES measurements in the energy region of 2.1–6.0 keV

Abstract

The total electron yield (TEY) mode has been developed successfully for XANES measurements at Beamline 4B7A of BSRF (Beijing Synchrotron Radiation Facility). Its performance was studied by measuring sulphur K-edge XANES of three CdS samples (mixed with graphite powder as an electric conductor) with different concentration: 75%, 50% and 25%. The data are collected in TEY mode and fluorescence yield (FY) mode respectively for comparison. The results demonstrate that the TEY spectra of three samples agree well with each other after the background is subtracted and normalized. The measured XANES spectra by TEY mode without bias and with 100V bias are almost identical to one another, but the signal-to-noise ratio of spectra measured without bias is better than that with 100V bias. The consistency of the self-absorption corrected FY spectra and TEY spectra are within 10% for the three samples.

Local Fine Structural Insight into Mechanism of Electrochemical Passivation of Titanium

“…The synchrotron radiation of 5 mrad (horizontal) × 0.43 mard (vertical) from the light source was accepted by the optical elements of the beamline, which deflected the radiation with a 1.1° angle to the cylindrical mirror paralleling the plane mirror. So the beam was focused to a 2.0 mm (horizontal) × 1.0 mm (vertical) spot . The XAFS experiments used the monochromator equipped with a pair of Si(111) crystals and were performed in a vacuum chamber.…”

“…So the beam was focused to a 2.0 mm (horizontal) × 1.0 mm (vertical) spot. 46 The XAFS experiments used the monochromator equipped with a pair of Si(111) crystals and were performed in a vacuum chamber. Data were recorded at 25 °C in total electron yield mode due to its high surface sensitivity and great signal-to-noise ratio.…”

X-ray absorption spectroscopic study of Pd2+ on Ni site in pentlandite

“…The position of the white line of the PdS reference is 0.3 eV higher than that of pentlandite. Such a Given small uncertainty due to the normalization of the spectra and correction of the PGM spectra to self-absorption, these effects can be due to nanoparticle size, adsorbate effect, and alloying effect (Koningsberger et al, 2000;Zheng et al, 2011;Todorovic, 2012). We exclude the contributions of size and adsorbate effect since they are not relevant to our samples.…”