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Title: Low-frequency nuclear quadrupole resonance with a dc SQUID

Abstract

Conventional pure nuclear quadrupole resonance (NQR) is a technique well suited for the study of very large quadrupolar interactions. Numerous nuclear magnetic resonance (NMR) techniques have been developed for the study of smaller quadrupolar interactions. However, there are many nuclei which have quadrupolar interactions of intermediate strength. Quadrupolar interactions in this region have traditionally been difficult or unfeasible to detect. This work describes the development and application of a SQUID NQR technique which is capable of measuring intermediate strength quadrupolar interactions, in the range of a few hundred kilohertz to several megahertz. In this technique, a dc SQUID (Superconducting QUantum Interference Device) is used to monitor the longitudinal sample magnetization, as opposed to the transverse magnetization, as a rf field is swept in frequency. This allows the detection of low-frequency nuclear quadrupole resonances over a very wide frequency range with high sensitivity. The theory of this NQR technique is discussed and a description of the dc SQUID system is given. In the following chapters, the spectrometer is discussed along with its application to the study of samples containing half-odd-integer spin quadrupolar nuclei, in particular boron-11 and aluminum-27. The feasibility of applying this NQR technique in the study of samples containingmore » integer spin nuclei is discussed in the last chapter. 140 refs., 46 figs., 6 tabs.« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley Lab., CA (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5258685
Report Number(s):
LBL-31124
ON: DE92014506
DOE Contract Number:
AC03-76SF00098
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis (Ph.D)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM 27; NUCLEAR QUADRUPOLE RESONANCE; BORON 11; ANALYTICAL SOLUTION; BORIC ACID; BORON NITRIDES; BORON OXIDES; HAMILTONIANS; KHZ RANGE 100-1000; NITROGEN; PETALITE; SAPPHIRE; SQUID DEVICES; TEMPERATURE RANGE 0000-0013 K; ALUMINIUM ISOTOPES; BORON COMPOUNDS; BORON ISOTOPES; CHALCOGENIDES; CORUNDUM; ELECTRONIC EQUIPMENT; ELEMENTS; EQUIPMENT; FLUXMETERS; FREQUENCY RANGE; HYDROGEN COMPOUNDS; INORGANIC ACIDS; ISOTOPES; KHZ RANGE; LIGHT NUCLEI; MATHEMATICAL OPERATORS; MEASURING INSTRUMENTS; MICROWAVE EQUIPMENT; MINERALS; NITRIDES; NITROGEN COMPOUNDS; NONMETALS; NUCLEI; ODD-EVEN NUCLEI; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; PNICTIDES; QUANTUM OPERATORS; RESONANCE; SILICATE MINERALS; STABLE ISOTOPES; SUPERCONDUCTING DEVICES; TEMPERATURE RANGE; 665100* - Nuclear Techniques in Condensed Matter Physics - (1992-); 661210 - Cryogenics- (1992-)

Citation Formats

Chang, J.W. Low-frequency nuclear quadrupole resonance with a dc SQUID. United States: N. p., 1991. Web. doi:10.2172/5258685.
Chang, J.W. Low-frequency nuclear quadrupole resonance with a dc SQUID. United States. doi:10.2172/5258685.
Chang, J.W. Mon . "Low-frequency nuclear quadrupole resonance with a dc SQUID". United States. doi:10.2172/5258685. https://www.osti.gov/servlets/purl/5258685.
@article{osti_5258685,
title = {Low-frequency nuclear quadrupole resonance with a dc SQUID},
author = {Chang, J.W.},
abstractNote = {Conventional pure nuclear quadrupole resonance (NQR) is a technique well suited for the study of very large quadrupolar interactions. Numerous nuclear magnetic resonance (NMR) techniques have been developed for the study of smaller quadrupolar interactions. However, there are many nuclei which have quadrupolar interactions of intermediate strength. Quadrupolar interactions in this region have traditionally been difficult or unfeasible to detect. This work describes the development and application of a SQUID NQR technique which is capable of measuring intermediate strength quadrupolar interactions, in the range of a few hundred kilohertz to several megahertz. In this technique, a dc SQUID (Superconducting QUantum Interference Device) is used to monitor the longitudinal sample magnetization, as opposed to the transverse magnetization, as a rf field is swept in frequency. This allows the detection of low-frequency nuclear quadrupole resonances over a very wide frequency range with high sensitivity. The theory of this NQR technique is discussed and a description of the dc SQUID system is given. In the following chapters, the spectrometer is discussed along with its application to the study of samples containing half-odd-integer spin quadrupolar nuclei, in particular boron-11 and aluminum-27. The feasibility of applying this NQR technique in the study of samples containing integer spin nuclei is discussed in the last chapter. 140 refs., 46 figs., 6 tabs.},
doi = {10.2172/5258685},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Jul 01 00:00:00 EDT 1991},
month = {Mon Jul 01 00:00:00 EDT 1991}
}

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