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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TL;DR: In this paper, a complete analysis of NQR data can be implemented on any microcomputer and the printer working with the computer can produce plots of experimental points in different coordinate systems as well as the fit curves.
Abstract: Theories explaining temperature dependences of frequency, line width and spin-lattice relaxation times in Nuclear Quadrupole Resonance (NQR) spectroscopy have been presented in the form of mathematical expressions. Hence a complete analysis of experimental data can easily be implemented on any microcomputer. This was demonstrated by the results obtained from 35Cl NQR studies of p,p′-DDT. The computer analysis allowed to separate different mechanisms of quadrupole relaxation and determine characteristic parameters: moments of inertia of the molecule, librational frequencies and activation energies of rotating molecular groups. Besides numerical values, the printer working with the computer can produce plots of experimental points in different coordinate systems as well as the fit curves.
11 citations
TL;DR: In this paper, a partial motional averaging of the splitting between the two edge singularities in the 35 Cl nuclear quadrupole resonance spectrum was proposed, and the mean square phase fluctuations were close to T I proportional to (T I − T ) −2β with β = 0.39 ± 0.04.
11 citations
TL;DR: In this article, the results of a theoretical investigation of two-frequency excitation in pure nuclear quadrupole resonance (NQR) for a spinI=1 nucleus with a nonaxial elecric field gradient are presented.
Abstract: The results of a theoretical investigation of two-frequency excitation in pure nuclear quadrupole resonance (NQR) for a spinI=1 nucleus with a nonaxial elecric field gradient are presented. The multipole tensor operator technique is used for the treatment of the one- and two-frequency pulse excitations. The results are applied to the characterization of the two-frequency signal of nitrogen14N nuclei. The experiments on sodium nitrite, NaNO2, confirm the presence of additional (two-frequency) echo in the NQR signal. The effect of resonance offsets on two-frequency NQR is also considered.
11 citations
Patent•
11 Jul 1996
TL;DR: In this article, the authors proposed an approach for testing a remote sample containing a given species of quadrupolar nucleus containing at least one probe (112) having a given maximum cross-sectional dimension.
Abstract: Apparatus for Nuclear Quadrupole Resonance testing a remote sample containing a given species of quadrupolar nucleus comprises at least one probe (112) having a given maximum cross-sectional dimension; means (102) for applying excitation to the probe or at least one of the probes to excite nuclear quadrupole resonance for a selected range of distance of the sample from the or one such probe, the selected range being at least one tenth of the given maximum dimension of the probe or said one such probe, the apparatus being adapted to produce a non-uniform field over the selected range; and means (106) for detecting the resonance response signal from the sample via the probe or at least one of the probes; the excitation being such as would generate non-zero resonance response signals at all distances within the selected range.
11 citations
11 citations