110 (327) BRUKER BIOSPIN User Manual Version 002
Basic CP-MAS Experiments
Figure 7.5. CPTOSS Experiment on Tyrosine HCl at 6.5 kHz
Figure 7.5. is a CPTOSS experiment on tyrosine HCl at 6.5 kHz sample rotation
using a 4 mm CPMAS triple resonance probe at 500 MHz with 256 accumulated
transients. Spinning sideband residuals can be observed outside a noise level of
approximately 2% peak to peak compared to the highest intensity. The residual
sidebands have up to 5% intensity compared to the highest resonance.
SELTICS 7.3
Like the TOSS experiment, SELTICS (Sideband ELimination by Temporary Inter-
ruption of the Chemical Shift) is an experiment for spinning sideband suppression.
Pulses on the
13
C channel are driven with pl11 and pulse times are rotor synchro-
nized. For optimum suppression, the shortest pulse (τ/24) of the sequences,
where
τ
r
is the rotor period, should be a π/2 pulse or stronger. Choose pl11 ac-
cordingly. Unlike TOSS, SELTICS is only 0.5 rotor periods long.
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