title: Enhanced sensitivity in RIACT/MQ-MAS NMR experiments using rotor assisted population transfer.
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.
authors.affiliation: Department of Chemistry, Ohio State University, Columbus, Ohio 43210-1173, USA.
authors.forename: H T
authors.initials: HT
authors.lastname: Kwak
authors.forename: S
authors.initials: S
authors.lastname: Prasad
authors.forename: Z
authors.initials: Z
authors.lastname: Yao
authors.forename: P J
authors.initials: PJ
authors.lastname: Grandinetti
authors.forename: J R
authors.initials: JR
authors.lastname: Sachleben
authors.forename: L
authors.initials: L
authors.lastname: Emsley