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One pitfall of calling it EPR is that overzealous copy editors may send you back your page proofs with it spelled out as “Einstein-Podolsky-Rosen”.Introduction Electron paramagnetic resonance (EPR), also known as electron spin resonance (ESR), is a sophisticated spectroscopic technique that detects free radicals in chemical and biological systems. Molecule that carry angular momentum of electronic origin. Molecule with paired electrons and zero magnetic field Diamagnetic Molecules with unpaired electrons and magnetic moment-Basic Principle Of ESR……………Boundary conditions have to be fulfilledby the electrical and magnetic components of the wave on the metalliwalls.
The detector is a crystal rectifier (diode) which consists of a semi-conducting material.Like, Spin labels, Structural determination, and Reaction velocities and reaction mechanisms.Analytical applications: Mn 2 ions can be measured and detected even when present in trace quantities.The intensity of ESR signal is directly proportional to the no. Hence using ESR we can measure relative concentration of free radicals. The ESR studies may be used in knowing the exact structures of solvated metal ions. ESR is used in the determination of oxidation state of metal. Copper is found to be divalent in copper protein complexes whereas it is found to be monovalent in some biologically active copper complexes.Investigation of molecules in the triple state A triple state molecule has a total spin S=1 so that, its multiplicity can be given as 2S 1=3. The information of unpaired electrons is very useful in various aspects in applications of ESR.