Basic Setup Procedures
User Manual Version 002 BRUKER BIOSPIN 77 (327)
The following parameters are set:
• pl12, for the initial 90 degree pulse and the decoupling during acquisition: set
for a 4.5 µsec proton 90 degree pulse (as previously determined)
• pl1, for the carbon contact pulse, set for a 4.5 µsec carbon pulse (as previous-
ly determined)
• p3, 4.5 µsec
• spnam0, set to ramp.100 to sweep the proton contact RF field from 50 to
100%
• sp0, set to pl12 -3 dB, to account for the lower average RF over the ramp.
• p15, 2-5 msec (after the value, specify m to make it milliseconds, else it is tak-
en as microseconds)
• cpdprg2, select cw
• o1, set between both adamantane peaks
• o2, set to be on resonance on adamantane protons
Acquire 2 or 4 scans, then set plot limits for both peaks, and optimise p3 (+/- 2
µsec) and pl1 (+/- 2 dB) for best signal. Fig. 21 shows a Hartmann-Hahn match
optimization over 4 dB using a ramp contact pulse going from 50 to 100% ampli
-
tude.
Figure 4.21. Hartmann-Hahn Optimization Profile
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