A series of supported Pd/ZrO₂ catalysts with Pd loading from 0.2 to 2 wt % was synthesized. The ZrO₂ material prepared by a similar technique was used as a reference sample. The samples have been characterized by means of transmission electron microscopy (TEM), X-ray diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR), testing reaction of e...

Optical and magnetic properties of SiO2:C nanopowders obtained by chemical and thermal modification of fumed silica were studied by Fourier transform infrared spectroscopy, Raman, continuous wave (CW) electron paramagnetic resonance (EPR), echo-detected EPR and pulsed electron nuclear double resonance (ENDOR) spectroscopy. Two overlapping signals of Lorentzian lineshape were detected in CW EPR ...

In 1921, Gerlach and Stern observed that a beam of silver atoms splits into two lines when it is subjected to a magnetic field [1–3]. While the line splitting in optical spectra, first found by Zeeman in 1896 [4, 5], could be explained by the angular momentum of the electrons, the s-electron of silver could not be subject to such a momentum, not to mention that an azimuthal quantum number l = 1...

Introduction EPR was the first spectroscopic method other than UV/visible spectroscopy to be applied systematically to investigations of the structure and functioning of metalloenzymes. The first such EPR studies of xanthine oxidase were reported in 1959 [l]. Since one reduced state of each of the four redox-active centres in the molecule is EPRactive, there is obviously considerable potential ...

ALEKSIEVA, K., I. NACHEVA, K. DIMOV and Tsv. TSVETKOV, 2016. Natural and gamma induced free radicals in dried fruits. An EPR study. Bulg. J. Agric. Sci., 22: 1010–1013 The aim of the present study is to prove radiation processing in air dehydrated dates, prunes and fi gs, as well as to recommend which part of the fruit to sample. The detection method is Electron Paramagnetic Resonance (EPR) spe...