Varian Solid-State NMR - DIPSHFT1-Separated Local Field Spectroscopy; Figure 47. DIPSHFT1 Pulse Sequence

6.18 DIPSHFT1—Separated Local Field Spectroscopy
01-999162-00 C0402 VNMR 6.1C User Guide: Solid-State NMR 108
srate is the actual spinning speed. Rotational resonance requires spinning speed control.
Set the spinning rate equal to the frequency difference between the two resonances of
interest (first sideband) or to an integral nth division (nth sideband).
References
Raleigh, D. P.; Levitt, M. H.; Griffin, R. G. Chem. Phys. Lett. 1988, 146, 71.
Raleigh, D. P.; Cruezet, F.; Das Gupta, J. K.; Levitt, M. H.; Griffin, R. G. J. Am. Chem.
Soc. 1989, 111, 4502.
6.18 DIPSHFT1—Separated Local Field Spectroscopy
The DIPSHFT1 pulse sequence is the separated local field spectroscopy (SLF) experiment
of Munowitz and Griffin, using windowless MREV8 as described by Zilm. Figure 47 is a
diagram of the sequence.
Applicability
DIPSHIFT, found in userlib, is available for
UNITY
INOVA and UNITYplus systems.
Macro
The macro dipshft1 converts a parameter set, obtained with XPOLAR or XPOLAR1,
for DIPSHFT1. Power levels and the proton 90
° pulse width are retained. The value of pp
is estimated from pw, dipolr, and crossp. Further calibration of pp may be necessary.
Parameters refocus and setup are both set to 'n'.
Figure 47. DIPSHFT1 Pulse Sequence
pw
cntct
cntct
(tpwrm)
(crossp)
Tx
Dec
at
d1
AC
(dipolr)
d2
periods/srate
pp
tau
0 to ('ni'- 1) times
<if refocus='n'>