Central-line intensity optimization with a two-pulse sequence in solid-state MAS NMR using a JDK1.3 applet

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Introduction to two-pulse MAS NMR

Aim: Optimization of the central-line intensity using a two-pulse sequence with a short interpulse delay where the first pulse excites the ±p-quantum coherences simultaneously. The powder sample is in a rotor spinning at the magic angle.

Two-pulse sequence with a short interpulse delay

Usually, an MQMAS NMR experiment on half-integer quadrupolar spin starts with the optimization of the ±p-quantum coherences using a two-pulse sequence. The interpulse delay tau1 is about 10 µs. Phase cycling is applied so that the first pulse excites the ±p-quantum coherences simultaneously. The second pulse converts them to -1-quantum coherence.

The standard optimization procedure is a two-step experiment:

In the first experiment, we keep constant the first-pulse length p1 and acquire a series of spectra for increasing length p2 of the second pulse.

In the second experiment, we acquire a series of spectra for increasing length p1 of the first pulse, where p2 corresponds to that generating the highest spectrum line intensity in the first experiment.

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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