NMR pulse sequence:
MQ-MAS signal enhancement with Quadrupolar CPMG

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MQ Quadrupolar Carr Purcell Meiboom Gill MAS

Larsen and coworkers introduced CPMG sequence into MQMAS experiment, that is, a train of selective rotor-synchronized Pi pulses during the MQMAS acquisition period.

The central-transition MAS echoes are successively accumulated to enhance the overall intensity. This approach generates sidebands along the F2 dimension.

Amplitude modulated split-t1 preparation for PFG 3QMAS

This figure represents the amplitude-modulated split-t1 preparation for 3Q-QCPMG-MAS sequence applied to spin I = 3/2.

Selecting both pathways should generate pure absorption 2D lineshape.

ACQUISITION: Hyper-complex or TPPI

Split-t1 approach avoids shearing transformation.

Amplitude modulated split-t1 preparation for PFG 3QMAS

This figure represents the amplitude-modulated split-t1 preparation for 3Q-QCPMG-MAS sequence applied to spin I = 5/2.

Selecting both pathways should generate pure absorption 2D lineshape.

ACQUISITION: Hyper-complex or TPPI

Split-t1 approach avoids shearing transformation.


Lefort and coworkers introduced a z-filter preparation for 3Q-QCPMQ-MAS experiment.

Amplitude modulated z-filter preparation for PFG 3QMAS

This figure represents the z-filter preparation for 3Q-QCPMG-MAS sequence applied to spin I = 5/2. The echo and anti-echo signals are observed.

ACQUISITION: Hyper-complex or TPPI

Shearing transformation is required to obtain 2D isotropic (in F1 dimension) anisotropic (in the F2 dimension) correlation spectrum.

Solid-state NMR bibliography for:

Aluminum-27
Antimony-121/123
Arsenic-75
Barium-135/137
Beryllium-9
Bismuth-209
Boron-11
Bromine-79/81
Calcium-43
Cesium-133
Chlorine-35/37
Chromium-53
Cobalt-59
Copper-63/65
Deuterium-2
Gallium-69/71
Germanium-73
Gold-197
Hafnium-177/179
Indium-113/115
Iodine-127
Iridium-191/193
Krypton-83
Lanthanum-139
Lithium-7
Magnesium-25
Manganese-55
Mercury-201
Molybdenum-95/97
Neon-21
Nickel-61
Niobium-93
Nitrogen-14
Osmium-189
Oxygen-17
Palladium-105
Potassium-39/41
Rhenium-185/187
Rubidium-85/87
Ruthenium-99/101
Scandium-45
Sodium-23
Strontium-87
Sulfur-33
Tantalum-181
Titanium-47/49
Vanadium-51
Xenon-131
Zinc-67
Zirconium-91
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