Coherent Reduction of Dipolar Interactions in Molecules Dissolved in Anisotropic Media Using a New Multiple-Pulse Sequence in a COSY Experiment

1994 ◽  
Vol 107 (2) ◽  
pp. 141-150 ◽  
Author(s):  
P. Lesot ◽  
J.M. Ouvrard ◽  
B.N. Ouvrard ◽  
J. Courtieu
Keyword(s):  
Pulse Sequence ◽  
Anisotropic Media ◽  
Dipolar Interactions ◽  
Multiple Pulse

Heteronuclear polarization transfer in static oriented systems using a windowless multiple-pulse sequence

2007 ◽  
Vol 439 (4-6) ◽  
pp. 407-411 ◽  
Author(s):  
S. Jayanthi ◽  
P.K. Madhu ◽  
Narayanan D. Kurur ◽  
K.V. Ramanathan
Keyword(s):  
Pulse Sequence ◽  
Polarization Transfer ◽  
Multiple Pulse

Relaxation Processes in NQR Multiple-Pulse Spin-Locking

1986 ◽  
Vol 41 (1-2) ◽  
pp. 366-369 ◽  
Author(s):  
N. E. Ainbinder ◽  
G. B. Furman ◽  
G. E. Kibrik ◽  
A. Yu. Poljakov ◽  
I. G. Shaposhnikov
Keyword(s):  
Time Constant ◽  
Pulse Sequence ◽  
Spin Echo ◽  
Rate Equations ◽  
Relaxation Processes ◽  
Quasi Equilibrium ◽  
Multiple Pulse ◽  
Spin Lattice ◽  
Kinetic Coefficients ◽  
Spin Locking

A theory of the spin-lattice and spin-spin relaxation processes in quadrupole spin systems with I > 1/2 in the situation of the multiple-pulse NQR spin locking is proposed for the pulse sequence MW-4. The theory is based on the assumption that for t ≳ T2 the change of the spin system is a quasi-equilibrium process. Rate equations for inverse generalized temperatures are obtained and the kinetic coefficients calculated for the case o f exponential correlation functions. The above assumption was confirmed for some substances containing the 35Cl and 123Sb, and the time constant T1e characterizing the spin echo signal decay was investigated and compared with the time constant T1q, in the case of continuous spin locking.

scholarly journals Heteronuclear and homonuclear radio-frequency-driven recoupling

2021 ◽  
Vol 2 (1) ◽  
pp. 343-353
Author(s):  
Evgeny Nimerovsky ◽  
Kai Xue ◽  
Kumar Tekwani Movellan ◽  
Loren B. Andreas
Keyword(s):  
Radio Frequency ◽  
Numerical Simulations ◽  
Crucial Role ◽  
Pulse Sequence ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Dipolar Interactions ◽  
Phase Cycling ◽  
Angle Spinning

Abstract. The radio-frequency-driven recoupling (RFDR) pulse sequence is used in magic-angle spinning (MAS) NMR to recouple homonuclear dipolar interactions. Here we show simultaneous recoupling of both the heteronuclear and homonuclear dipolar interactions by applying RFDR pulses on two channels. We demonstrate the method, called HETeronuclear RFDR (HET-RFDR), on microcrystalline SH3 samples at 10 and 55.555 kHz MAS. Numerical simulations of both HET-RFDR and standard RFDR sequences allow for better understanding of the influence of offsets and paths of magnetization transfers for both HET-RFDR and RFDR experiments, as well as the crucial role of XY phase cycling.

Homonuclear Hartmann–Hahn transfer with reduced relaxation losses by use of the MOCCA-XY16 multiple pulse sequence

2004 ◽  
Vol 166 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Julien Furrer ◽  
Frank Kramer ◽  
John P Marino ◽  
Steffen J Glaser ◽  
Burkhard Luy
Keyword(s):  
Pulse Sequence ◽  
Multiple Pulse

Coherent reduction of dipolar interactions in molecules dissolved in liquid-crystal solvents using a new multiple-pulse technique during acquisition

1991 ◽  
Vol 93 (2) ◽  
pp. 225-241
Author(s):  
Jean-Michel Ouvrard ◽  
Bao Ngoc Ouvrard ◽  
Jacques Courtieu ◽  
Charles L Mayne ◽  
David M Grant
Keyword(s):  
Liquid Crystal ◽  
Dipolar Interactions ◽  
Pulse Technique ◽  
Multiple Pulse
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