Enhanced sensitivity in RIACT/MQ-MAS NMR experiments using rotor assisted population transfer

H T Kwak; S Prasad; Z Yao; P J Grandinetti; J R Sachleben; L Emsley

doi:10.1006/jmre.2001.2313

Enhanced sensitivity in RIACT/MQ-MAS NMR experiments using rotor assisted population transfer

J Magn Reson. 2001 May;150(1):71-80. doi: 10.1006/jmre.2001.2313.

Authors

H T Kwak¹, S Prasad, Z Yao, P J Grandinetti, J R Sachleben, L Emsley

Affiliation

¹ Department of Chemistry, Ohio State University, Columbus, Ohio 43210-1173, USA.

PMID: 11330985
DOI: 10.1006/jmre.2001.2313

Abstract

The rotor assisted population transfer (RAPT) sequence is used to enhance the sensitivity of the RIACT(II) experiment for spin-3/2 quadrupolar nuclei. A detailed theoretical analysis of the polarizations that contribute to different types of MQ-MAS experiments is provided. In particular, two polarization pathways are distinguished for the creation of triple-quantum coherence. The existence of these pathways is experimentally demonstrated by comparing the sensitivities of different sequences with and without RAPT preparation.