1. Electron Paramagnetic Resonance (EPR)
EPR is a spectroscopic technique that detects chemical species that have unpaired electrons. A great number of materials contain such paramagnetic entities, which may occur either as electrons in unfilled conduction bands, electrons trapped in radiation damaged sites, or as free radicals, various transition ions, bi-radicals, triplet states, impurities in semi-conductors, as well as other types.

2. Electron Paramagnetic Resonance Instrument - Strouse Group Research - UC Santa Barbara
We are a research group in the Department of Chemistry and Biochemistry at the University of California, Santa Barbara. The principle focus of our research is the integrated design and optical spectroscopy of nanometer-scale materials.

3. Electron Paramagnetic Resonance
The Lab The EPR (Electron Paramagnetic Resonance) Lab at California State University at Northridge engages in research and teaching in the area of EPR. This is an experimental technique similar to the famous magnetic resonance imaging technique used as a diagnostic tool in medicine. Students at the undergraduate and graduate level are involved in all of the research. The research topics are in the two broad areas of biophysics and chemical physics as follows......

4. Electron Paramagnetic Resonance
Introduction.....When an atom or molecule with an unpaired electron is placed in a magnetic field, the spin of the unpaired electron can align either in the same direction or in the opposite direction as the field. These two electron alignments have different energies and application of a magnetic field to an unpaired electron lifts the degeneracy of the ±1/2 spins of the electron. Electron-paramagnetic-resonance (EPR) or electron-spin-resonance (ESR) spectroscopy measures the <A HREF='/chem-ed/spec/spectros.htm#absorption">absorption of microwave radiation by an unpaired electron when it is placed in a strong magnetic field. STriplet-state molecules

5. NIST Electron Paramagnetic Resonance Facility
NIST is leading a national and international effort in electron paramagnetic resonance (EPR) dosimetry for measuring ionizing radiation. Paramagnetic centers (molecules or atoms with unpaired electrons) are produced by the action of radiation on materials. In the EPR measurement, irradiated materials are placed in a magnetic field and electron spin transitions are induced by an electromagnetic field of the appropriate frequency (typically in the GHz range). EPR is used as a non-destructive probe of the structure and concentration of paramagnetic centers. The centers created by ionizing radiation are proportional to the absorbed dose and provide a sensitive and versatile measurement method.

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