Dynamical Decoupling of Spin-Clusters using Solid State NMR

Abstract: In this work we experimentally study the efficiency of various dynamical decoupling sequences for suppressing decoherence of single as well as multiple quantum coherences on large spin-clusters. The system involves crystallites of a powdered sample containing a large number of molecular protons interacting via long-range dipole-dipole interaction. The multiple quantum coherences are prepared by progressively creating correlations in the spin lattice using standard pulse sequences implementing two-quantum average Hamiltonian. The spin system is then subjected to various dynamical decoupling sequences, followed by conversion into observable single quantum coherence by using time-reversal sequence. The experiments reveal superior performance of the recently introduced RUDD sequences in suppressing the decoherence.