Combining adiabatic and Hartmann-Hahn cross-polarization for sensitivity enhancement in solid state separated local field 2D-NMR experiments of partially ordered systems

Lobo, Nitin P and Ramanathan, K V (2012) Combining adiabatic and Hartmann-Hahn cross-polarization for sensitivity enhancement in solid state separated local field 2D-NMR experiments of partially ordered systems. In: CHEMICAL PHYSICS LETTERS, 536 . pp. 155-161.

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Abstract

In this Letter, we examine magnetization in double- and zero-quantum reservoirs of an ensemble of spin-1/2 nuclei and describe their role in determining the sensitivity of a class of separated local field NMR experiments based on Hartmann-Hahn cross-polarization. We observe that for the liquid crystal system studied, a large dilute spin-polarization, obtained initially by the use of adiabatic cross-polarization, can enhance the sensitivity of the above experiment. The signal enhancement factors, however, are found to vary and depend on the local dynamics. The experimental results have been utilized to obtain the local order-parameters of the system. (C) 2012 Elsevier B. V. All rights reserved.

Item Type:	Journal Article
Publication:	CHEMICAL PHYSICS LETTERS
Publisher:	Science Direct
Additional Information:	Copy right for this article belongs to Elsevier B V
Keywords:	NUCLEAR-MAGNETIC-RESONANCE;NMR-SPECTROSCOPY;LIQUID-CRYSTALS; HIGH-RESOLUTION;MEMBRANE-PROTEINS;DIPOLAR COUPLINGS;SPIN DYNAMICS;DILUTE SPINS;MAGIC-ANGLE;RF POWER
Department/Centre:	Division of Chemical Sciences > NMR Research Centre (Formerly Sophisticated Instruments Facility) Division of Physical & Mathematical Sciences > Physics
Date Deposited:	16 Jul 2012 10:08
Last Modified:	16 Jul 2012 10:08
URI:	http://eprints.iisc.ac.in/id/eprint/44625

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