IFEG 20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
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
Lugar:
La Falda, Córdoba
Reunión:
Congreso; Mini-School on Disordered Systems 2008 and 6th International Workshop on Disordered Systems; 2008
Institución organizadora:
ICTP (Trieste)
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.
