Measuring radical diffusion in viscous liquids by electron paramagnetic resonance

Quantitative detection of plasma-generated free radicals in liquids by electron paramagnetic resonance spectroscopy

This work focused on qualitative and quantitative detection of oxygen free radicals in liquids after plasma treatment with an atmospheric pressure argon plasma jet by electron paramagnetic resonance spectroscopy (EPR). For the treatment, a shielded plasma jet, where the active effluent zone is surrounded by a protective gas curtain was used.

Electron Paramagnetic Resonance

where E0 is the energy level without any external magnetic field B = B0êz. Again, g denotes the g factor[5]. For induced transitions, the selection rule is ∆ms = ±1. For unpaired electrons, however, this selection rule is observed for all transitions, as S = 12 and, hence, ms ∈ {− 12 , 2}. The previous formulas are based on the assumption that the response of the material on the external magnet...

Electron Paramagnetic Resonance

Hyperpolarization via dissolution dynamic nuclear polarization (DNP) is a versatile method to dramatically enhance the liquid-state NMR signal of X-nuclei and can be used for performing metabolic and molecular imaging. It was recently demonstrated that instead of incorporating persistent radicals as source of unpaired electron spins, required for DNP, nonpersistent radicals can be photoinduced ...

Electron Paramagnetic Resonance Theory

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...

Electron Paramagnetic Resonance Theory