Journal ArticleDOI
Nuclear quadrupole resonance exchange spectroscopy with shaped radiofrequency pulses
Samanwita Pal,N. Chandrakumar +1 more
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TLDR
In this paper, a 1D shaped pulse NQR spectroscopy was used for the detection of the Cl3C group in polycrystalline chloral hydrate [Cl3C-CH(OH)2] using a suitably modulated shaped RF pulse.Abstract:
Recent work on the nuclear quadrupole resonance (NQR) investigation of molecular dynamics in the solid state has relied on 2D methods. We report our studies of dynamic processes by 1D shaped pulse NQR spectroscopy. Significant advantages include considerably shorter experimental duration, clear definition of the exchange time window, and avoidance of off-resonance effects. The reorientation of the Cl3C˜ group in polycrystalline chloral hydrate [Cl3C–CH(OH)2] is considered as a test case. This may be modelled as a three-site exchange process. An analysis of the generalised Bloch–McConnell equation is performed to formulate the kinetic matrix. The present approach involves simultaneous excitation of the sites that undergo chemical exchange by employing a suitably modulated shaped RF pulse, followed by a mixing time, and finally a suitable read pulse for signal detection. The experimental signal intensities are plotted against the mixing time to extract the kinetic parameters, i.e. the exchange rate and the ...read more
Citations
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Study of the polymorphic states of chloral hydrate by 35Cl NQR relaxometry
TL;DR: In this paper, the results of an experimental study of the molecular crystal of chloral hydrate in α - and β -forms by 35Cl NQR relaxometry method with using of inverse Laplace transformation are presented.
Journal ArticleDOI
Study of dynamics in pentachlorophenol in the solid state by 1D Nuclear Quadrupole Resonance exchange spectroscopy
Samanwita Pal,N. Chandrakumar +1 more
TL;DR: In this paper, the dynamic process in pentachlorophenol (PCP) in the solid state by one-dimensional Nuclear Quadrupole Resonance (NQR) exchange spectroscopy employing shaped rf pulses was studied.
References
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Journal ArticleDOI
Relaxation by slow motional processes. effect of molecular rotations in pure quadrupole resonance
S. Alexander,A. Tzalmona +1 more
TL;DR: In this paper, a theory of the direct effect of molecular rotations on longitudinal spin relaxation in pure quadrupole resonance is described and applied to the hexamethylene tetramine.
Journal ArticleDOI
Advances in magnetic resonance.
TL;DR: No wonder you activities are, reading will be always needed, it is not only to fulfil the duties that you need to finish in deadline time, but to encourage your mind and thoughts.
Journal ArticleDOI
Temperature Dependence of the Chlorine Pure Quadrupole Resonance Frequency in Molecular Crystals
H. S. Gutowsky,D. W. McCall +1 more
TL;DR: The Cl35 pure quadrupole resonance frequency has been observed in polycrystalline CH2Cl2, CHCl3, CHCL3, CCl4, (CH3)3CCl, and CH3ClClCl3 at temperatures of 77°K and above.
Journal ArticleDOI
Nuclear Quadrupole Resonance Study of Chloral Hydrate
Hideaki Chihara,Nobuo Nakamura +1 more
TL;DR: In this paper, three nuclear quadrupole resonance lines were observed in chloral hydrate at temperatures 20-300K, the frequencies being 38.2863±0.0004 MHz(ν1), 39.5415± 0.0002(ν2), and 39.6252± 0.0002(π).
Journal ArticleDOI
Zero-Field Nuclear Quadrupole Spin-Lattice Relaxation in the Rotating Frame
G. W. Leppelmeier,E. L. Hahn +1 more
TL;DR: In this paper, the spectral density functions of lattice vibrations were used to evaluate the nuclear quadrupole spin-lattice relaxation rates in different frames of reference for pure electric quadrupoles coupling.