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Title: Direct current superconducting quantum interference device spectrometer for pulsed nuclear magnetic resonance and nuclear quadrupole resonance at frequencies up to 5 MHz

Abstract

A spectrometer based on a dc superconducting quantum interference device (SQUID) has been developed for the direct detection of nuclear magnetic resonance (NMR) or nuclear quadrupole resonance (NQR) at frequencies up to 5 MHz. The sample is coupled to the input coil of the niobium-based SQUID via a nonresonant superconducting circuit. The flux locked loop involves the direct offset integration technique with additional positive feedback in which the output of the SQUID is coupled directly to a low-noise preamplifier. Precession of the nuclear quadrupole spins is induced by a magnetic field pulse with the feedback circuit disabled; subsequently, flux locked operation is restored and the SQUID amplifies the signal produced by the nuclear free induction signal. The spectrometer has been used to detect {sup 27}Al NQR signals in ruby (Al{sub 2}O{sub 3}[Cr{sup 3+}]) at 359 and 714 kHz. {copyright} {ital 1996 American Institute of Physics.}

Authors:
;  [1]
  1. Department of Physics, University of , California (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory
OSTI Identifier:
286880
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 67; Journal Issue: 8; Other Information: PBD: Aug 1996
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; MAGNETIC SPECTROMETERS; SQUID DEVICES; NUCLEAR MAGNETIC RESONANCE; NUCLEAR QUADRUPOLE RESONANCE; ELECTRONIC CIRCUITS; MHZ RANGE 01-100; ALUMINIUM 27; RUBY

Citation Formats

TonThat, D M, Clarke, J, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Direct current superconducting quantum interference device spectrometer for pulsed nuclear magnetic resonance and nuclear quadrupole resonance at frequencies up to 5 MHz. United States: N. p., 1996. Web. doi:10.1063/1.1147122.
TonThat, D M, Clarke, J, & Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Direct current superconducting quantum interference device spectrometer for pulsed nuclear magnetic resonance and nuclear quadrupole resonance at frequencies up to 5 MHz. United States. doi:10.1063/1.1147122.
TonThat, D M, Clarke, J, and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720. Thu . "Direct current superconducting quantum interference device spectrometer for pulsed nuclear magnetic resonance and nuclear quadrupole resonance at frequencies up to 5 MHz". United States. doi:10.1063/1.1147122.
@article{osti_286880,
title = {Direct current superconducting quantum interference device spectrometer for pulsed nuclear magnetic resonance and nuclear quadrupole resonance at frequencies up to 5 MHz},
author = {TonThat, D M and Clarke, J and Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720},
abstractNote = {A spectrometer based on a dc superconducting quantum interference device (SQUID) has been developed for the direct detection of nuclear magnetic resonance (NMR) or nuclear quadrupole resonance (NQR) at frequencies up to 5 MHz. The sample is coupled to the input coil of the niobium-based SQUID via a nonresonant superconducting circuit. The flux locked loop involves the direct offset integration technique with additional positive feedback in which the output of the SQUID is coupled directly to a low-noise preamplifier. Precession of the nuclear quadrupole spins is induced by a magnetic field pulse with the feedback circuit disabled; subsequently, flux locked operation is restored and the SQUID amplifies the signal produced by the nuclear free induction signal. The spectrometer has been used to detect {sup 27}Al NQR signals in ruby (Al{sub 2}O{sub 3}[Cr{sup 3+}]) at 359 and 714 kHz. {copyright} {ital 1996 American Institute of Physics.}},
doi = {10.1063/1.1147122},
journal = {Review of Scientific Instruments},
number = 8,
volume = 67,
place = {United States},
year = {1996},
month = {8}
}