NMR pulse sequence:
split-t1 MQ-MAS




Home and Applets > Pulse Sequence > Split-t1 MQ-MAS

Split-t1 MQ-MAS

Wimperis and coworkers introduced both amplitude-modulated and phase-modulated split-t1 approaches to MQMAS experiment. In the following, only the phase modulated case is considered.

The t1 evolution period is split between multiple- and single-quantum precession such that the second order quadrupolar broadening is refocused at the end of t1, thereby avoiding the need for shearing.

Shifting the echo by a time tau ensures the collection of the whole echo during the acquisition time and its appearance at a fixed position in the t2 time domain. The third pulse is a selective pi pulse for the central transition.

As with the shifted-echo pulse sequences, the echo amplitude and the antiecho amplitude have opposite signs.

Split-t1 3QMAS sequence with phase modulation for I = 3/2

For 3-quantum MAS with phase-modulated split-t1 experiment applied to I = 3/2 system, the anti-echo pathway is involved. Therefore, the anti-echo is recorded.

ACQUISITION: F1-QF


Split-t1 3QMAS sequence with phase modulation for I = 5/2

For 3-quantum MAS with phase-modulated split-t1 experiment applied to I = 5/2 system, the echo pathway is involved. Therefore, the echo is recorded.

ACQUISITION: F1-QF


Split-t1 5QMAS sequence with phase modulation for I = 5/2

For 5-quantum MAS with phase-modulated split-t1 experiment applied to I = 5/2 system, the anti-echo pathway is involved. Therefore, the anti-echo is recorded.

ACQUISITION: F1-QF

 

(top)

[Contact me] - Last updated December 15, 2012
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



Copyright 2002- pascal-man.com. All rights reserved.