Document Detail

Enhancing sensitivity of quadrupolar nuclei in solid-state NMR with multiple rotor assisted population transfers.
MedLine Citation:
PMID:  12943905     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Rotor-assisted population transfer (RAPT) was developed as a method for enhancing MAS NMR sensitivity of quadrupolar nuclei by transferring polarization associated with satellite transitions to the central m=12-->-12 transition. After a single RAPT transfer, there still remains polarization in the satellite transitions that can be transferred to the central transition. This polarization is available without having to wait for the spin system to return to thermal equilibrium. We describe a new RAPT scheme that uses the remaining polarization of the satellites to obtain a further enhancement of the central transition by performing RAPT-enhanced experiments multiple times before waiting for re-equilibration of the spin system. For 27Al (I=5/2) in albite we obtain a multiple RAPT enhancement of 3.02, a 48% increase over single RAPT. For 93Nb (I=9/2) in NaNbO(3) we obtain a multiple RAPT enhancement of 5.76, an 89% increase over single RAPT. We also describe a data processing procedure for obtaining the maximum possible signal-to-noise ratio.
Hyung-Tae Kwak; Subramanian Prasad; Ted Clark; Philip J Grandinetti
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Solid state nuclear magnetic resonance     Volume:  24     ISSN:  0926-2040     ISO Abbreviation:  Solid State Nucl Magn Reson     Publication Date:    2003 Sep-Nov
Date Detail:
Created Date:  2003-08-28     Completed Date:  2004-04-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9306181     Medline TA:  Solid State Nucl Magn Reson     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  71-7     Citation Subset:  -    
Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, Columbus, OH 43210-1173, USA.
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