MQ-MAS Experiment

Multiple Quantum Magic-Angle Spinning (MQ-MAS) is a solid-state NMR method for obtaining a high resolution spectrum of half-integer spin quadrupolar nuclei. It was invented by Professor Lucio Frydman and coworkers. It is performed as a two-dimensional NMR experiment, and correlates a high resolution (isotropic) spectrum to the anisotropic central transition MAS spectrum. Below are the two most basic MQ-MAS sequences.

To determine when the MQ-MAS echo occurs in t₂ consult the table below:

k values for MQ-MAS experiment
Spin	t₁ transition	k
3/2	3QMAS	7/9

5/2	3QMAS	19/12
	5QMAS	25/12

7/2	3QMAS	101/45
	5QMAS	11/9
	7QMAS	161/45

9/2	3QMAS	91/36
	5QMAS	95/36
	7QMAS	7/18
	9QMAS	31/6

For additional implementation details (phase cycling and data processing), please see the references below, particularly, Massiot et al. Solid-State NMR, 6, 73 (1996).

References and Related Resources from our Lab

027 - Solid-State NMR, 6, 73 (1996),
Two-dimensional Magic-Angle Spinning Isotropic Reconstruction Sequences for Quadrupolar Nuclei,
D. Massiot, B. Touzo, D. Trumeau, J. P. Coutures, J. Virlet, P. Florian and P. J. Grandinetti
Our Shifted Echo MQ-MAS Sequence for Bruker

Philip J. Grandinetti

MQ-MAS Experiment

References and Related Resources from our Lab