Category
- Spectroscopy and Spectrometry ยป ESR Spectroscopy
Booking Details
Facility Management Team and Location
Facility Features, Working Principle and Specifications
Specifications
- 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 Principle
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.
Instructions for Registration, Sample Preparation, User Instructions, Precautionary Measures and Charges
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
| University | National Lab/R&D's | Industry | IIT 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 |
| University | National Lab/R&D's | Industry | IIT 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. |
Applications
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