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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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Journal ArticleDOI
TL;DR: In this article, the resonance frequencies of cyclic α-chloro ethers of known configuration were analyzed and the resonance frequency of chlorine atoms in equatorial positions was shown to be 2.5 MHz higher than those of corresponding chlorine atoms at axial positions.
Abstract: 35Cl nuclear quadrupole resonance spectra of cyclic α-chloro ethers of known configuration are presented. The resonance frequencies of chlorine atoms in equatorial positions are in every case some 2.5 MHz higher than those of corresponding chlorine atoms in axial positions. Similar results are obtained for open-chain trichloromethyl ethers and the effect is sufficiently well-defined to distinguish between configurational isomers and establish their conformation. These results may be rationalised in terms of a model in which the lone-pair electrons on the oxygen atom hyperconjugate with the electrons of the CCl bond.

21 citations

Journal ArticleDOI
TL;DR: In this paper, the deuterium nuclear magnetic resonance and nuclear quadrupole resonance of chloroauric acid tetrahydrate, H5O2+AuCl4−· 2H2O has been studied from 180 to 300°K.
Abstract: Proton and deuterium nuclear magnetic resonance and chlorine‐35 nuclear quadrupole resonance of chloroauric acid tetrahydrate, H5O2+AuCl4−· 2H2O has been studied from 180 to 300°K. Phase transitions are observed at 290°K (Solid I↔ Solid II) and at 218°K (Solid II↔ Solid III) in ordinary chloroauric acid tetrahydrate. In the deuterated compound the lower‐phase transition shifts upward by 33° to 252°K; an upper‐phase transition was not detected below 300°K. The chlorine‐35 NQR consists of two lines (1:1 intensity ratio) above the Solid II—III phase transition and three lines (1:2:1 intensity ratio) below this transition. The proton spin—lattice relaxation time T1 of H5O2+AuCl4−· 2H2O exhibits a minimum at 273°K which is assigned to the interbond jump motion of the bridging proton in the H5O2+ ion. The activation energy for this process is 5.7 kcal mole−1 in Solid II and 11.7 kcal mole−1 in Solid III. Rotating frame relaxation times have minima at 200 and 233°K which are assigned to the interbond jump proces...

21 citations

Journal ArticleDOI
TL;DR: This paper proposes two hybrid detectors that can exploit the signals from multiple components, offering improved probability of detection, as compared to recently proposed detectors.

21 citations

Journal ArticleDOI
TL;DR: A systematic computational study to investigate hydrogen bond (HB) interactions in the real crystalline structures of L-cysteine by density functional theory calculations of electric field gradient (EFG) tensors reveals that the EFG tensors of (17)O, (14)N, and (2)H are influenced and show particular trends from monomer to the target molecule in the cluster.

21 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202320
202237
202116
202036
201928
201829