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Molecular Beams$
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Norman Ramsey

Print publication date: 1986

Print ISBN-13: 9780198520214

Published to Oxford Scholarship Online: September 2007

DOI: 10.1093/acprof:oso/9780198520214.001.0001

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NUCLEAR ELECTRIC QUADRUPOLE MOMENTS

NUCLEAR ELECTRIC QUADRUPOLE MOMENTS

Chapter:
(p.310) XI NUCLEAR ELECTRIC QUADRUPOLE MOMENTS
Source:
Molecular Beams
Author(s):

Norman F. Ramsey

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198520214.003.0011

The magnitude of a nuclear electric quadrupole moment is given by Q=(3z2-r2)Av where the average is taken over the nuclear charges when MI=I. Nuclear quadrupole moments are detected in molecular beam resonance experiments by interacting with q, the gradient of the molecular electric field which contributes to the molecular energy and shifts the resonance frequencies. The product eqQ/h is measured in the experiment, tables of eqQ/h are given for many molecules and approximate methods for calculating q are discussed. The discovery that there was a nonzero electric quadrupole moment for the deuteron showed for the first time that the deuteron was not spherically symmetric and that there was a tensor nuclear force between a proton and a deuteron. The value of q in the important case of molecular D2 has been sufficiently accurately calculated to give Q to better than 1% accuracy.

Keywords:   electric quadrupole moment, gradient of electric field, deuteron, tensor nuclear force

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