FREQUENCY-MODULATED AND PHASE-MODULATED HETERONUCLEAR DECOUPLING IN ROTATING SOLIDS

Authors
GAN ZH ERNST RR
Citation
Zh. Gan et Rr. Ernst, FREQUENCY-MODULATED AND PHASE-MODULATED HETERONUCLEAR DECOUPLING IN ROTATING SOLIDS, Solid state nuclear magnetic resonance, 8(3), 1997, pp. 153-159
Citations number
11
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical","Physics, Condensed Matter
Journal title
Solid state nuclear magnetic resonance → ACNP
ISSN journal
09262040
Volume
8
Issue
3
Year of publication
1997
Pages
153 - 159
Database
ISI
SICI code
0926-2040(1997)8:3<153:FAPHDI>2.0.ZU;2-Z
Abstract
The mechanism of heteronuclear dipolar decoupling by the TPPM sequence s, proposed by Bennett et al. (J. Chem. Phys. 103 (1995) 6951) is inve stigated by comparison with a modified pulse sequence, called TPFM, th at uses frequency instead of phase modulation. By combining frequency and phase modulations, circularly modulated sequences are designed. Th e fact that only the left-handed modulation sequence FMPML leads to im proved proton decoupling, while the right-handed modulation sequence F MPMR is ineffective, proves that the efficient decoupling is caused by a secondary resonance effect. (C) 1997 Elsevier Science B.V.