CPMG sequence – Carr-Purcell­Meiboom-Gill sequence

A sequence of pulses used for spin-echo experi­ments in nuclear magnetic resonance (NMR) in which the initial pulse is 90° followed by a series of 180° pulses. A CPMG sequence is designed so that the spin echoes die away ex­ponentially with time. Spin-spin re­laxation occurs characterized by a time constant T2, which can be deter­mined from the decay signal.



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