quadrupole splitting

in Mössbauer spectroscopy
https://doi.org/10.1351/goldbook.Q04972
The measured Doppler velocity difference between the two peaks seen in quadrupole split spectra from @N04257@ such as 57Fe and 119Sn.
Source:
PAC, 1976, 45, 211. (Nomenclature and Conventions for Reporting Mössbauer Spectroscopic Data) on page 214 [Terms] [Paper]
Cite as: IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook.
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Last revised: February 24, 2014