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nuclear quadrupole moment (spectroscopic)

A parameter which describes the effective shape of the equivalent ellipsoid of the nuclear charge distribution, Q > 0 for prolate (e.g. 57Fe, 197Au); Q < 0 for oblate (e.g. 119Sn, 129I) nuclei.
PAC, 1976, 45, 211 (Nomenclature and Conventions for Reporting Mossbauer Spectroscopic Data) on page 214
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.N04238.
Original PDF version: http://www.iupac.org/goldbook/N04238.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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