We present a corroborative study of the structural characterization lithium-substituted barium vanadate glasses using Raman and electron paramagnetic resonance (EPR) spectroscopy. Investigation thermal physical properties these showed gradual increase in concentration nonbridging oxygen. EPR analysis gave an insight into changing structure glasses. Both spectroscopic techniques confirmed that v...

A significant problem with paramagnetic tags attached to proteins and nucleic acids is their conformational mobility. Each tag is statistically distributed within a volume between 5 and 10 Angstroms across; structural biology conclusions from NMR and EPR work are necessarily diluted by this uncertainty. The problem is solved in electron spin resonance, but remains open in the other major branch...

Abstract. Electron paramagnetic resonance (EPR) spectroscopy is the method of choice to investigate and quantify species in many scientific fields, including materials science life sciences. Common EPR spectrometers use electromagnets microwave (MW) resonators, limiting their application dedicated lab environments. Here, novel aspects voltage-controlled oscillator (VCO)-based EPR-on-a-Chip (EPR...

Electron paramagnetic resonance (EPR) performed with a scanning tunneling microscope (STM) allows for probing the spin excitation of single atomic species MHz energy resolution. One basic applications conventional EPR is precise determination magnetic moments. However, in an STM, local fields spin-polarized tip can introduce systematic errors measurement moments by EPR. We propose to solve this...

Direct spectroscopic measurements of rotational motions of proteins and large protein segments are crucial to understanding the molecular dynamics of protein function. Fluorescent probes and spin labels attached to proteins have proved to be powerful tools in the study of large-scale protein motions. Fluorescence depolarization and conventional electron paramagnetic resonance (EPR) are applicab...

For the study of defects in III-V semiconductors an enhancement of sensitivity with respect to the conventional detection of electron paramagnetic and electron-nuclear double resonance (EPR/ENDOR) is necessary, because of low defect concentrations together with broad EPR lines and very small sample volumes as in the case of epitaxial layers. This can be achieved by optical detection of EPR and ...

Glass systems of composition 90R(2)B(4)O(7)+9PbO+1Fe(2)O(3) (R=Li, Na and K) and 90Li(2)B(4)O(7)+(10-x)PbO+xFe(2)O(3) (x=0.5, 1, 3, 4, 5, 7 and 9 mol %) have been investigated by means of electron paramagnetic resonance (EPR) and optical absorption techniques. The EPR spectra exhibit three resonance signals at g approximately 6.0, 4.2 and 2.0. The resonances at g approximately 6.0 and 4.2 are a...

In photosynthetic bacteria, light-induced electron transfer takes place in a protein called the reaction center (RC) leading to the reduction of a bound ubiquinone molecule, Q(B), coupled with proton binding from solution. We used electron paramagnetic resonance (EPR) and electron-nuclear double resonance (ENDOR) to study the magnetic properties of the protonated semiquinone, an intermediate pr...

Electron paramagnetic resonance (EPR)-based oximetry is capable of quantifying oxygen content in samples. However, for a heterogeneous environment with multiple pO2 values, peak-to-peak linewidth of the composite EPR lineshape does not provide a reliable estimate of the overall pO2 in the sample. The estimate, depending on the heterogeneity, can be severely biased towards narrow components. To ...