llustrate an NMR spectrometer and explain its working.
NMR spectrometer (Nuclear Magnetic resonance) is a spectrometer that is based on the absorption of electromagnetic radiation in the radiofrequency region i.e 4 to 900 MHz by nuclei of the atoms.
Principle working: When there is no application of magnetic field, the nuclei which are electrically charged spin randomly in directions.
When there is application of magnetic field, the nuclei spin either in the same direction or in opposite direction of magnetic field.
When magnetic field is applied, there will be energy transfer between the ground state to excited state that corresponds to the radiofrequency and spins returns to the base level where energy is emitted with the same frequency.
The radiofrequency signals emitted give the NMR spectrum of the concerned nucleus which is directly proportional to the magnetic field strength.
= Bo/2
where Bo is magnetic field applied and is Magnetogyric ratio
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