Proton chemical shift values for which it is defined as a standard, there are signs of high intensity signs TMS appears in only one place, and originating at a special low-frequency, thus leading to the reference substance. Therefore, the signal of Methyl salicylate is thara chemical shift values Simon Lane, to zero by this method does not use any magnetic field will be chemical shift of the Proton, it will always be unchanged because the frequency of the signal that absorb protons are changed, but the frequency of the reference substance, it does not change accordingly. When taken for relative values by dividing The numbers are the original constants.
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