Electron Paramagnetic Resonance (EPR) or Electron Spin Resonance (ESR) spectroscopy is an experimental technique that allows to study systems with at least one unpaired electron. The EPR can be employed to study free radicals in solid, liquid or gaseous phases, isolated atoms and ions, ions of the transition metal and actinide group in solids, localized imperfections in solids (point defects), systems with conduction electrons. This spectroscopic technique allows to estimate the concentration of paramagnetic defects and to obtain information on the microscopic structure of the paramagnetic centers under study.
The technique has been successfully employed in different field such as radiation effects, chemistry, biochemistry, biophysics, biology and medical applications, materials science, radiation metrology, geology, physic and others.
EPR spectrometer: JEOL JES-X310
Microwave frequency: 8.75-9.65 GHz (X-Band)
Microwave power : 100nW - 200mW
Maximum Magnetic field : 650 mT
Modulation frequency : 25 KHz, 50 KHz and 100 KHz
Measurement Temperature : From ~110 to ~ 450 K