6.24 SSECHO1—Solid-State Echo Sequence for Wideline Solids
01-999162-00 C0402 VNMR 6.1C User Guide: Solid-State NMR
118
Applicability
SSECHO1 is available only on
UNITY
INOVA and UNITYplus. It is found in userlib.
Macro
The macro ssecho1 converts a parameter set for the quadrupole echo pulse sequence
SSECHO1. Power parameters and pw are retained. If tpwrm is not present (as in many
older parameter sets), ssecho1 creates it and sets it to the value of tpwrf. If tpwrf is
not present, tpwrm is set to 4095. The default parameters provide for a quadrupole echo
with a pulse delay of 20 microseconds.
UNITY
INOVA and UNITY
plus
Power Parameters
ssecho1 makes use of the generic power parameters tpwr, tpwrm, dpwr, dpwrm, and
pw. for
UNITY
INOVA and UNITYplus systems. These parameters have a consistent definition
in most
UNITY
INOVA and UNITYplus single-resonance (i.e, wideline and CRAMPS) pulse
sequences They are also consistent with the parameters of xpolar1 (with xpol='n')
with the exception that the parameter dipolr replaces dpwrm in xpolar1 as the
decoupler linear modulator voltage level.
tpwr is the observe power setting (–16 dB minimum to 63 dB maximum power).
tpwrm is the observe linear modulator voltage setting (0 minimum to 4095 maximum
voltage). The value of tpwrm is linearly proportional to the applied signal voltage.
Doubling tpwrm halves the value of the pulse width.
dpwr is the decoupler power setting (–16 dB minimum to 63 dB maximum power).
dpwrm is the decoupler linear modulator voltage setting during acquisition (0 minimum to
4095 maximum voltage). dpwrm is linearly proportional to the applied decoupler voltage.
Doubling dpwrm doubles the decoupler field strength (in kHz).
pw is the observe 90
° pulse, in microseconds.
Other Parameters
echo set to 'y' implements either a quadrupole echo or a composite echo (see compul
below). echo set to 'n' implements a single pulse (the first pulse of the quadrupole echo)
pw
AB C
attau1 tau2
p180
p1
d1 d2
Figure 53. SSECHO1 Pulse Sequence
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