Congresos y reuniones científicas
Título:
Comparison of spin dynamics characterized by MQ evolution under different Hamiltonians.
Autor/es:
C.M. SÁNCHEZ; A.K. CHATTAH; P.R. LEVSTEIN; R. H. ACOSTA
Reunión:
Congreso; Mini-School on Disordered Systems 2008 and 6th International Workshop on Disordered Systems; 2008
Resumen:
In this work we present multiple quantum solid state NMR experiments to study the many-body dynamics of spin systems. A
new pulse sequence is designed to characterize the dipolar evolution
encoded in different coherence orders in the Zeeman basis. Experiments
were performed in polycrystalline Adamantane (infinite 1H system) and
in the liquid crystal 5CB in the nematic mesophase (closed cluster).
The difference in the proton-proton interactions in both systems is
correlated with the behavior of the coherence order buildups. Spin
counting measurements give information on the geometrical arrangement
of spins and cluster formation. The experiment also provides insight on
the sources of decoherence during the evolution.
A comparison between the evolution under dipolar and double quantum
Hamiltonian is discussed.