TY - JOUR
T1 - Two-Dimensional Satellite-Transition MAS NMR of Quadrupolar Nuclei: Shifted Echoes, High-Spin Nuclei and Resolution
AU - Pike, Kevin J
AU - Ashbrook, Sharon Elizabeth
AU - Wimperis, Stephen
PY - 2001/9/21
Y1 - 2001/9/21
N2 - Modifications to the satellite-transition magic angle spinning (STMAS) experiment for obtaining high-resolution NMR spectra of quadrupolar nuclei are discussed. A phase-modulated 'shifted-echo' STMAS experiment that yields pure absorptive lineshapes is presented and shown to be compatible with the 'split-t(1)' technique used in multiple-quantum (MQ) MAS NMR to reduce the duration of t(2) acquisition and avoid shearing the final two-dimensional spectrum. The application of STMAS to nuclei with spin greater than I = 3/2 is also considered. the dispersion of isotropic shifts achieved by STMAS and MQMAS are compared, and the effects of anisotropic 'cross-term' broadening mechanisms on linewidths in 'isotropic' STMAS spectra are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
AB - Modifications to the satellite-transition magic angle spinning (STMAS) experiment for obtaining high-resolution NMR spectra of quadrupolar nuclei are discussed. A phase-modulated 'shifted-echo' STMAS experiment that yields pure absorptive lineshapes is presented and shown to be compatible with the 'split-t(1)' technique used in multiple-quantum (MQ) MAS NMR to reduce the duration of t(2) acquisition and avoid shearing the final two-dimensional spectrum. The application of STMAS to nuclei with spin greater than I = 3/2 is also considered. the dispersion of isotropic shifts achieved by STMAS and MQMAS are compared, and the effects of anisotropic 'cross-term' broadening mechanisms on linewidths in 'isotropic' STMAS spectra are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
KW - RESIDUAL DIPOLAR COUPLINGS
KW - SPECTRA
UR - http://www.scopus.com/inward/record.url?scp=0000601460&partnerID=8YFLogxK
U2 - 10.1016/s0009-2614(01)00912-5
DO - 10.1016/s0009-2614(01)00912-5
M3 - Article
SN - 0009-2614
VL - 345
SP - 400
EP - 408
JO - Chemical Physics Letters
JF - Chemical Physics Letters
ER -