Phase-modulated Lee-Goldburg

Recently, Vega and co-workers have presented a phase-modulated Lee-Goldburg experiment (PMLG) experiment, in which only the phase of a series of adjacent pulses is changed, i.e., a i remains constant.76 77 In an ingenious reinterpretation of the LG concept, the zero-order term in the average Hamiltonian can be shown to vanish when the modulation of the pulse phase described by... 

E. Vinogradov. P. K. Madhu and S. Vega, Proton spectroscopy in solid state nuclear magnetic resonance with windowed phase modulated Lee-Goldburg decoupling sequences. Chem. Phys. Lett., 2002, 354, 193-202. 

The performance of windowed phase-modulated Lee-Goldburg (wPMLG) and the windowed decoupling using mind boggling optimisation (wDUMBO) sequences at various MAS rates and nutation frequencies of the pulses has been compared. Additionally, supercycled and non-super-cycled implementations of wDUMBO have been compared. The interaction between the supercycled homonuclear dipolar decoupling sequences and the sample rotation has also been analysed using symmetry-based selection rules. 

S. V. Dvinskikh, H. Zimmermaim, A. Maliniak, and D. Sandstrom, Heteronuclear dipolar recoupling in solid-state nuclear magnetic resonance by amplitude-, phase-, and frequency-modulated Lee-Goldburg cross-polarization, J. Chem. Phys. 122 044512 (2005). 

In this section, we consider windowless homonuclear decoupling sequences. Specific examples are the Lee—Goldburg (LG) technique [101] and refinements, namely the frequency switched and phase-modulated LG (FSLG [102, 103] and PMLG [104]) sequences, as well as the computer-optimised sequence, DUMBO-1... 

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