CH1012
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9
INFORMATION FROM NMR
A. Chemical Shifts
Internal Standard: Peak positions are measured relative to an internal standard that is placed in the NMR tube with the sample.
Tetramethylsilane (TMS) (CH3)4Si
 - the standard used for organic solvents
        units of d (delta) scale:   1d =  1 ppm
1 ppm = 1 part per million of the spectromet. operating frequency (eg. 300 MHz)
The d scale is therefore independent of the spectrometer frequency.