Electron Spin Resonance Spectrometer (ESR - JEOL)

                 Kindly download Material Safety Data sheet and submit the hardcopy of filled sheet along with your sample

Make : JEOL, Japan
Model : JES - FA200 ESR Spectrometer with X and Q band
Specification : EStandard Frequency (X band) - 8.75-9.65 GHz
  Sensitivity - 7x109 spins/0.1mT
  Resolution - 2.35(micro)T or better
  Temperature study - Any temp. from +200oC to liquid nitrogen temp.
Available accessories : Aqueous cell, Sample Angular Rotation device, Electrochemical cell, UV irradiation, sample mixing cell.

    Electron Spin resonance spectroscopy is based on the absorption of microwave radiation by an unpaired electron when it is exposed to a strong magnetic field. Species that contain unpaired electrons (namely free radicals, odd-electron molecules, transition metal complexes, rare earth ions, etc.) can therefore be detected by ESR.

  Working Principles   

         When an atomic or molecular system with unpaired electrons is subjected to a magnetic field, the electronic energy levels of the atom or molecule will split into different levels. The magnitude of the splitting is dependent on the strength of the applied magnetic field. The atom or molecule can be excited from one split level to another in the presence of an external radiation of frequency corresponding to the frequency obtained from the difference in energy between the split levels. Such an excitation is called a magnetic resonance absorption. The atom or molecule under investigation may be in different environments in an actual sample. The magnetic resonance frequency will hence be influenced by the local environment of the atom or molecule. The electron spin resonance technique is therefore, a probe for a detailed identification of the various atomic and molecular systems and their environments and all associated parameters.


Electron Spin Resonance, ESR, is a powerful non-destructive and non-intrusive analytical method. ESR yields meaningful structural information even from ongoing chemical or physical processes, without influencing the process itself. It is the ideal technique to complement other analytical methods in a wide range of application areas.

One can perform studies related to :
     Molecular structure
     Crystal structure
     Reaction kinetics
     Valence electron wave functions
     Molecular motion

     Relaxation properties
     Electron transport
     Crystal / ligand fields
     Reaction mechanisms
  Contact Us   

     Contact : 022-21596885
     Email Id : esrlab@iitb.ac.in

  User Instructions   
         1. Clearly mention state the model of ESR Spectormeter for your sample analysis.
         2. Analysis charges would vary depending on model selection. Relevent charges are given under each model
         3. Clearly state the type of analysis required.
             Powder/Solution and also RT/77K
             For solution sample suggest name of solvent.
         4. Experiments can be carried out at ambient temperature, liquid nitrogen temperature and most of the temperatures between liquid nitrogen temperature and 200o C.
         5. Experiments can be carried out with samples in liquid, solid or gaseous form, which includes single crystals, metal alloys, liquid crystals, organic radicals, polymers, glasses, powders, triplets, polyradicals, conduction electrons, drugs, rare-earths, enzymes, proteins and gases.
         6. Provide minimum 25-50 mg of solid sample in powder form.
         7. Provide minimum 2-3 ml of liquid sample.

 ESR-JEOL, Japan (New) Charges excluding GST  
  UniversityNational Lab/R&D'sIndustryIIT User 
X Band Room Temperature (RT)375/-1125/-1875/-190/-Per Sample
Variable Temperature -170oc to +200oc 500/-1500/-2500/-250/-Per Temp.
Liquid nitrogen temp. (77K) 500/-1500/-2500/-250/-Per Sample
# Single crystals using Goniometer
Room temperature measurement
250/-750/-1250/-125/-Per Rotation
# Single crystals using Goniometer
Liquid nitrogen temperature measurement
350/-1050/-1750/-175/-Per Rotation
* At liquid Helium temperature measurement 8500/-10000/-12000/-4250/-Per Hour

  UniversityNational Lab/R&D'sIndustryIIT User 
* Q Band Room Temperature (RT)350/-1050/-1750/-175/-Per Sample

# Subject to minimum of three angle measurements.
* We may need to pool the samples for liquid Helium temperature experiments, Q-band and also those measurements with VT (variable temperature) accessory. Additional waiting time may occur due to this.