NMR Delta Scale
Shifts are reported as delta = (nu_sample - nu_reference)/nu_spectrometer in parts per million, a field-independent scale referenced to tetramethylsilane at 0 ppm. This lets shift tables (e.g. aromatic H ~7-8 ppm, aldehyde H ~9-10 ppm) transfer between 60 MHz and 900 MHz instruments.
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Shifts are reported as delta = (nu_sample - nu_reference)/nu_spectrometer in parts per million, a field-independent scale referenced to tetramethylsilane at 0 ppm. This lets shift tables (e.g. aromatic H ~7-8 ppm, aldehyde H ~9-10 ppm) transfer between 60 MHz and 900 MHz instruments.
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