Varian Solid-State NMR - MQ_SOLIDS-Multiple-Quantum Solids; Figure 57. MQ_SOLIDS Pulse Sequence

Chapter 6. Solid-State NMR Experiments
123 VNMR 6.1C User Guide: Solid-State NMR 01-999162-00 C0402
Reference
Spiess, H..; Schmidt-Rohr, K.; Clauss, J.; Blumich, B. Magn. Reson. Chem. 1990, 28,
S3.
6.28 MQ_SOLIDS—Multiple-Quantum Solids
A
1
H 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 multiple-
quantum transitions and detection uses the magic echo sequence. Figure 57 is a diagram of
the 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.
mloop is the number of times (typically, 7) through the first multiple pulse cycle.
shift is the TPPI phase increment. The units of this parameter have not been fully
checked. Use the display command to confirm units.
t1inc is the t
1
increment in the convention of a 2D experiment. The units of this parameter
have not been fully checked. Use the display command to confirm units.
t1init is the initial delay increment. The units of this parameter have not been fully
checked. Use the display command to confirm units.
Reference
Baum, J.; Munowitz, M.; Garroway, A. N.; Pines, A. J. Chem. Phys. 1985, 83, 2015.
Figure 57. MQ_SOLIDS Pulse Sequence
Tx
d1
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
t1init
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
ddel
pw
ddelp
pw
d3
p1 p1
pw
p1-0.5*pw-rof2
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
1.5u
1
.
5
u
50.0u
5
0
.
0
u
3.0s
1
.
0
u
1
.
5
u
0.6u
4.9u
0.6u
4.9u
0.6u
4.9u
0.6u
4.9u
0.2u
0.6u
4.9u
0.6u
4.9u
0.6u
4.9u
0.6u
4.9u
1.0u 4.9u