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6.34 MQ_SOLIDS—Multiple-Quantum Solids Parameters The parameters are analogous to those in all multiple-pulse experiments: pw is the 90° pulse, in microseconds. tau is the time delay, in microseconds, between pulses. In the case of MREV8, the cycle time is 12*tau. mix is the mixing time, in microseconds, for 1H spin diffusion. cycles is the number of times through the multiple pulse cycle. cycles and tof, in combination, determine the chemical shift. Reference Spiess, H..; Schmidt-Rohr, K.; Clauss, J.; Blumich, B. Magn. Reson. Chem. 1990, 28, S3. 6.34 MQ_SOLIDS—Multiple-Quantum Solids A 1H multiple-quantum spectrum can be obtained in the solid state in the manner of Pines and Baum. The pulse sequence, called MQ_SOLIDS, generates even order multiplequantum transitions and detection uses the magic echo sequence. Figure 53 is a diagram of the sequence. 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 1.5u 50.0u 50.0u 1.5u d1 4.9u 1.0u 4.9u 0.6u 4.9u 0.6u 4.9u 0.6u 4.9u 0.2u 0.6u 4.9u 0.6u 0.6u 0.6u 4.9u 3.0s 4.9u Tx 4.9u 0.6u 1.0u u pw pw pw pw pw pw pw pw ddel pw pw pw pw pw pw pw p1 p1 ddel ddel ddel ddel t1init ddel ddel ddel d3 pw ddelp ddelp ddelp ddelp pw ddelp ddelp ddelp p1-0.5*pw-rof2 ddelp Figure 53. MQ_SOLIDS Pulse Sequence Macro Macro mq_solids generates the parameters for the multiple-quantum experiment. Parameters del is the short interpulse delay, in microseconds. delp is the long interpulse delay, in microseconds. 01-999162-00 A0800 VNMR 6.1C User Guide: Solid-State NMR 108
