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Reference frequency Click 'Calculate...' to see result
The NMR reference frequency (sf on Bruker instruments) for a given nuleus may be calculated from the reference frequency of another standard nucleus, commonly 1H but in solid state 13C is used. When the probe does not have a 1H coil then 2H may be used instead. In the field 'Show' choose if you want to see only the common nuclei (1H, 2H, 13C, 15N, 19F, and 31P), most nuclei or all nuclei including the very unusual ones. Choose the standard and target nucleus. Enter the frequency of the standard. Click on 'Calculate reference frequency' to show the reference value.
The reference values for 14N and 15N are those for liquid ammonia as commonly used by biologists. Many physicists use nitromethane as a reference. The reference value for 83Kr is for low pressure gas that is approximately 180 ppm on the IUPAC scale.