IFEG   20353
INSTITUTO DE FISICA ENRIQUE GAVIOLA
Unidad Ejecutora - UE
artículos
Título:
Evolution of multiple quantum coherences with scaled dipolar Hamiltonian
Autor/es:
SÁNCHEZ, CLAUDIA M.; CHATTAH, ANA K.; PASTAWSKI, HORACIO M.; BULJUBASICH, LISANDRO
Revista:
JOURNAL OF MAGNETIC RESONANCE
Editorial:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Referencias:
Año: 2017 vol. 281 p. 75 - 81
ISSN:
1090-7807
Resumen:
In this article, we introduce a pulse sequencewhich allows themonitoring of multiple quantum coherences distribution of correlated spin states developed with scaled dipolar Hamiltonian. The pulse sequence is a modification of our previous Proportionally Refocused Loschmidt echo (PRL echo) with phase increment, in order to verify the accuracy of the weighted coherent quantum dynamics. The experiments were carried out with different scaling factors to analyze the evolution of the total magnetization, the time dependence of the multiple quantum coherence orders, andthe development of correlated spins clusters. In all cases, a strong dependence between the evolution rate and the weighting factor is observed. Remarkably, all the curves appeared overlapped in a single trend when plotted against the self-time, a new time scale that includes the scaling factor into the evolution time. In other words, the spin system displayed always the same quantum evolution, slowed down as the scaling factor decreases, confirming the high performance of the new pulse sequence.