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Slow relaxation of longitudinal multispin orders in weakly and strongly coupled two‐spin systems
Author(s) -
D'Silva Loyola,
Pola Arunima,
Dutta Prasanta,
Martinez Gary V.,
Sprenger Peter,
Gillies Robert J.,
Kuchel Philip W.,
Sendhil Velan S.
Publication year - 2012
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.3820
Subject(s) - spins , chemistry , relaxation (psychology) , population , scalar (mathematics) , spin (aerodynamics) , dipole , condensed matter physics , nuclear magnetic resonance , physics , neuroscience , thermodynamics , demography , geometry , mathematics , organic chemistry , sociology , biology
Longitudinal multispin order (LOMO) corresponds to a nonequilibrium population distribution in spin systems that exhibit scalar ( J ), dipolar, or quadrupolar coupling. We investigated the relaxation of longitudinal two‐spin order (2‐LOMO) in systems that had either weakly or strongly J ‐coupled spins. Our results indicated longer relaxation times for the 2‐LOMO state compared with the corresponding longitudinal single‐spin state (1‐LOMO). Accessing nuclear spin states that have relaxation times longer than T 1 , without the use of external contrast agents, is potentially useful for in vivo imaging and also for studying systems using dynamically hyperpolarized nuclear spins where longer life times are sought to increase the time available to study (bio)chemical events. Copyright © 2012 John Wiley & Sons, Ltd.