NMR pulse sequence:
z-filter MQ-MAS

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Z-filter MQ-MAS

Amoureux and coworkers introduced the z-filter approach to MQMAS experiment. It symmetrizes the coherence transfer pathways of both echo and anti-echo signals.

It acquires the echo and anti-echo signals with the same intensity. Therefore, z-filter approach is an amplitude-modulated sequence, which provides us with a pure absorption 2D lineshape.

The delay tau is of order of few microseconds. The third pulse is a selective pi/2 pulse for the central transition.

Z-filter MQMAS sequence

The echo amplitude and the antiecho amplitude have the same sign.

For a spin I = 3/2 and 3QMAS experiment,

0Q -> +3Q -> +0Q -> -1Q is the anti-echo pathway,

0Q -> -3Q -> +0Q -> -1Q is the echo pathway.

For the other half-integer spins and 3QMAS experiment,

0Q -> +3Q -> +0Q -> -1Q is the echo pathway,

0Q -> -3Q -> +0Q -> -1Q is the anti-echo pathway.

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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