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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24 Apr 2006TL;DR: In this paper, 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.
23 citations
TL;DR: WURST pulse sequences may afford an efficient new method for experimentally detecting impedance mismatches between receiving and excitation circuits, allowing for the optimization of solids and solution NMR and NQR spectrometer systems.
23 citations
TL;DR: In this paper, a combination of the electronic band structure calculations within the density functional theory (DFT) approach and 69,71 Ga nuclear quadrupole resonance (NQR) spectroscopy is presented.
23 citations
TL;DR: In this article, the Pople theory of chemical shift has been employed to present a theoretical interpretation for observed nitrogen chemical shifts in heteroaromatic molecules, and it was found that the chemical shifts of the diazines depend on both the pi and sigma-electronic distributions on the nitrogen atoms.
Abstract: The Pople theory of chemical shift has been employed to present a theoretical interpretation for observed nitrogen chemical shifts. In the absence of low‐lying n→π* transitions which give rise to a large paramagnetic shift, the shielding of nitrogen, as predicted by theory, arises primarily from: (1) the electron density on nitrogen; (2) the mean‐excitation energy; and (3) the effect of multiple bonds of nitrogen. A theoretical expression was also derived for calculations of nitrogen chemical shifts in heteroaromatic molecules. It was found that the chemical shifts of the diazines depend on both the pi‐ and sigma‐electronic distributions on the nitrogen atoms. The variations in the nitrogen sigma‐electronic densities estimated from chemical shift data are in reasonable agreement with those observed in nuclear quadrupole resonance studies.
23 citations
TL;DR: In the superconducting La2CuO4+δ obtained by annealing in high pressure mixture gas of oxygen and argon, nuclear quadrupole resonance (NQR) signals of 63Cu and 65Cu have been observed around 33.1 and 36.0 MHz together with the antiferromagnetic Cu NMR signal around 70-100 MHz as discussed by the authors.
23 citations