Pulsed Fourier-transform NQR of sup 14 N with a dc SQUID

Journal Article · Mon Jul 27 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.684· OSTI ID:7286012

Huerlimann, M D; Pennington, C H; Fan, N Q; Clarke, J; Pines, A; Hahn, E L ^[1]

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1. Department of Physics, University of California, Berkeley, Berkeley, California 94720 (United States) Department of Chemistry, University of California, Berkeley, Berkeley, California 94720 (United States) Materials Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)

The zero-field free induction decay of solid ammonium perchlorate at 1.5 K has been directly detected with a dc superconducting quantum interference device. The Fourier-transform spectrum consists of three sharp lines at 17.4, 38.8, and 56.2 kHz arising from pure {sup 14}N nuclear quadrupole resonance transitions. The absence of splittings and resonance transitions from dipolar-coupled proton spins is attributed to reorientation of the ammonium groups by quantum tunneling in combination with motional averaging in the three proton levels characterized by the irreducible representation {ital T}. The measured {sup 14}N spin-spin relaxation time is 22{plus minus}2 ms and the spin-lattice relaxation time is 63{plus minus}6 ms.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7286012
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:4; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

665100* -- Nuclear Techniques in Condensed Matter Physics -- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
AMMONIUM COMPOUNDS
AMMONIUM PERCHLORATES
CHLORINE COMPOUNDS
ELECTRONIC EQUIPMENT
EQUIPMENT
FLUXMETERS
FOURIER TRANSFORM SPECTROMETERS
HALOGEN COMPOUNDS
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
MEASURING METHODS
MICROWAVE EQUIPMENT
NITROGEN 14
NITROGEN ISOTOPES
NUCLEAR QUADRUPOLE RESONANCE
NUCLEI
ODD-ODD NUCLEI
OXYGEN COMPOUNDS
PERCHLORATES
PULSE TECHNIQUES
RELAXATION
RELAXATION TIME
RESONANCE
SPECTROMETERS
SPIN ECHO
SPIN-LATTICE RELAXATION
SPIN-SPIN RELAXATION
SQUID DEVICES
STABLE ISOTOPES
SUPERCONDUCTING DEVICES