observation frequency

https://doi.org/10.1351/goldbook.08389
Frequency corresponding to the centre of the spectrum window for a given nucleus under observation and the nominal frequency used to generate the hard, full spectrum pulses.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 699 [Terms] [Paper]