Topic
Nuclear quadrupole resonance
About: Nuclear quadrupole resonance is a research topic. Over the lifetime, 3531 publications have been published within this topic receiving 38801 citations. The topic is also known as: Nuclear quadrupole resonance spectroscopy & NQR.
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Patent•
02 Aug 2004TL;DR: The use of a high temperature superconductor self-resonant receive coil or transmit and receive coil that is coupled through mutual inductance to the receiver front-end of a nuclear quadrupole resonance system results in improved performance.
Abstract: The use of a high temperature superconductor self-resonant receive coil or transmit and receive coil that is coupled through mutual inductance to the receiver front-end of a nuclear quadrupole resonance system results in improved performance.
21 citations
TL;DR: In this article, a simple theory of the pressure dependences of nqr frequencies in molecular crystals is proposed, which accounts for all data presently available, and the static and dynamic contributions are of opposite signs; the static contribution is negative and becomes numerically larger as the strength of intermolecular bonding increases.
Abstract: Nuclear quadrupole resonance frequencies for the metal and chlorine atoms in AsCl3 and SbCl3 have been measured as functions of temperature and pressure. These data are analysed to obtain the isothermal volume dependences and the isochoric temperature dependences of the field gradient parameters. Existing knowledge of the Group V trichlorides shows that the strength of intermolecular bonding increases in the order AsCl3 < SbCl3 < BiCl3, and this trend is reflected in the relative importance of volume effects in determining the nqr frequencies in these solids. A simple theory of the pressure dependences of nqr frequencies in molecular crystals is proposed, which accounts for all data presently available. The pressure coefficient contains static and dynamic contributions which are of opposite signs; the static contribution is negative and becomes numerically larger as the strength of intermolecular bonding increases.
21 citations
TL;DR: In this paper, NQR and NMR studies of crystalline lead diborate (PbO·2B 2 O 3 ) and lead borate glasses have been performed at liquid nitrogen temperature (77 K).
Abstract: 11 B NQR and NMR studies of crystalline lead diborate (PbO·2B 2 O 3 ) and lead borate glasses have been performed at liquid nitrogen temperature (77 K). Two NQR lines were detected at 406.7 and 482.5 kHz PbO·2B 2 O 3 , indicating two distinct types of BO 4 units. Quadrupole parameters for both sites were obtained. It is suggested that the NQR spectra of the glasses do not show components due to asymmetric BO 3 units (with one or two non-bridging oxygens) throughout the glass-forming region. However, there exist at least two types of symmetric BO 3 units with slightly different quadrupole parameters.
21 citations
21 citations
Patent•
29 Apr 2005TL;DR: In this article, the methods of the invention for scanning a band of frequencies using a nuclear quadrupole resonance detection system with an array of high temperature superconductor sensors were described.
Abstract: The methods of the invention for scanning a band of frequencies using a nuclear quadrupole resonance detection system with an array of high temperature superconductor sensors to detect nuclear quadrupole resonance signals improve the nuclear quadrupole resonance detection system performance.
21 citations