Nuclear-quadrupole induction of atomic polarization

Journal Article · Tue Nov 01 00:00:00 EST 1988 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.38.8609· OSTI ID:6727321

Sleator, T; Hahn, E L; Heaney, M B; Hilbert, C; Clarke, J

Nuclear-quadrupole-induced electric signals are measured as a new resonance response mechanism that is the reciprocal of the Stark effect in magnetic resonance. In single crystals that have noncentrosymmetry with respect to the sites of precessing nuclear-quadrupole moments, the electronic polarizability of atoms and chemical bonds on opposite sides of the nuclear-quadrupole moment is not the same. The oscillating electric field produced by the quadrupole moment induces a net electric dipole moment in its neighboring electronic environment. The coherent summation of these dipole moments over the Boltzmann distribution of the nuclear ensemble produces an oscillating macroscopic electric dipole moment. The sample is placed between the plates of a capacitor that is tuned with an inductance to the nuclear precession frequency. Coherent nuclear precession is initiated following a rf magnetic field pulse that tips the nuclear spins into the precession mode. The voltage signal from the capacitor gives rise to an oscillating current in the series circuit and magnetic flux in the inductor. Stray magnetic induction pickup signals are balanced out. The flux is coupled to a dc superconducting quantum interference device (SQUID), which produces a voltage output at the nuclear-quadrupole resonance frequency of approx.30 MHz for /sup 35/Cl nuclei in NaClO/sub 3/ at 4.2 K. The /sup 35/Cl nucleus induces electric dipole moments in nearby oxygen atoms bonded to the Cl atom. Measured free-precession electric signals are compared to the predictions of a point-oxygen-atom polarizability model applied to the Cl: O bond. The technique is sensitive to chirality and to bond angles.

• Research Organization: Department of Physics, University of California, Berkeley, California 94720
• OSTI ID: 6727321
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 38:13
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHLORINE 35
NUCLEAR QUADRUPOLE RESONANCE
SODIUM CHLORIDES
CRYSTAL STRUCTURE
SODIUM OXIDES
BOND ANGLE
CHLORATES
ELECTRIC FIELDS
LARMOR PRECESSION
POLARIZABILITY
SQUID DEVICES
STARK EFFECT
ULTRALOW TEMPERATURE
ALKALI METAL COMPOUNDS
CHALCOGENIDES
CHLORIDES
CHLORINE COMPOUNDS
CHLORINE ISOTOPES
ELECTRICAL PROPERTIES
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
HALIDES
HALOGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MICROWAVE EQUIPMENT
NUCLEI
ODD-EVEN NUCLEI
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PRECESSION
RESONANCE
SODIUM COMPOUNDS
STABLE ISOTOPES
SUPERCONDUCTING DEVICES
360202* - Ceramics
Cermets
& Refractories- Structure & Phase Studies