Introduction

Electronic Spin Resonance ESR (Electronic Paramagnetic Resonance EPR)

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Electron spin resonance (ESR), also known as electron paramagnetic resonance (EPR) and electron magnetic resonance (EMR), is the name given to the process of resonant absorption of microwave radiation by paramagnetic ions or molecules, with at least one unpaired electron spin, and in the presence of a static magnetic field. ESR was discovered by Zavoisky in 1944. It has a wide range of applications in chemistry, physics, biology, and medicine: it may be used to probe the "static" structure of solid and liquid systems, and is also very useful in investigating dynamic processes.

The most commonly used ESR spectrometer is in the range of 9-10 GHz (X-band). However, advances in electronics have facilitated the development of spectrometers working at frequencies ranging from several hundred MHz to several hundred GHz.

* 1-2 GHz (L-band) and 2-4 GHz (S-band)

* 8-10 GHZ (X-Band)

* 35 Ghz (Q-band) and 95 GHz (W-band)

There is one ESR Spectrometer from JEOL (FA200) locates at our Nuclear Magnetic Resonance Laboratory (S8-01-10).