274 (327) BRUKER BIOSPIN User Manual Version 002
CRAMPS: General
range appears scaled down. The scaling factor depends on the pulse sequence
used. To achieve a spectrum comparable to spectra acquired conventionally, the
shift range must be scaled up again by this scaling factor, i.e. the spectral window
given by the repetition rate of the pulse sequence must be multiplied by this scal
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ing factor in order to place the resonances correctly. This scaling factor can be
calculated from the tilt angle, but is also slightly dependant on the offset and RF-
field. Since the correct chemical shifts are usually unknown, one must be aware of
the fact that the shifts may not be as precise as they are in high resolution liquids
experiments. An example of shift calibration, taking the scaling factor into ac
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count, will be given in the practical chapter.
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