Improvement of homonuclear dipolar decoupling sequences in solid-state nuclear magnetic resonance utilising radiofrequency imperfections.
The often annoying imperfections in the phases and pulses of typical radiofrequency multiple-pulse irradiation schemes for homonuclear dipolar decoupling are revisited and analysed here. The analysis is with respect to one such multiple-pulse sequence, namely, the windowed phase-modulated Lee-Goldburg sequence. The error terms in the Hamiltonian due to pulse imperfections may lead to effective rotation of the spins around the z-axis giving rise to image free and high-resolution 1H spectra. Certain precautions to be taken with regard to scale factor estimation are also detailed. The analysis also points out the range of off-set values where the best homonuclear dipolar decoupling performance of a particular pulse scheme may be obtained.
Bosman
Leon
L
Department of Chemical Physics, Weizmann Institute of Science, Rehovot 76100, Israel.
Madhu
P K
PK
Vega
Shimon
S
Vinogradov
Elena
E
D000465:Algorithms; D000596:Amino Acids / Q000032:analysis* / Q000737:chemistry*; D016477:Artifacts; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted
D000596:Amino Acids