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Quantum system under RF pulse                


        Category:basic NMR

        Starting from the equilibrium of a two level system (slightly more population in the lower energy 
state), when we supply energy to the system in the form of RF radiation, the population of the 
higher energy state starts increasing. At some point of time the population difference gets 
inverted (pi pulse). How the population difference comes to normal if we continue supplying the 
energy for exactly double the time of that of a pi pulse?

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