Analysis of the performance of a phase alternated multiple pulse sequence in spin I = 7/2 zero-field NQR spectroscopy

1997 ◽  
Vol 92 (6) ◽  
pp. 1035-1038 ◽  
Author(s):  
A. RAMAMOORTHY
Keyword(s):  
Pulse Sequence ◽  
Zero Field ◽  
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.

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

Two-dimensional Nutation Echo Nuclear Quadrupole Resonance Spectroscopy

1990 ◽  
Vol 45 (3-4) ◽  
pp. 575-580 ◽  
Author(s):  
Gerard S. Harbison ◽  
Andris Slokenbergs
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Pulse Sequence ◽  
Resonance Spectroscopy ◽  
Zero Field ◽  
Two Dimensional ◽  
Quadrupolar Nucleus ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
The Asymmetry ◽  
Asymmetry Parameters

Abstract We discuss two new two-dimensional nuclear quadrupole resonance experiments, both based on the principle of nutation spectroscopy, which can be used to determine the asymmetry parameter, and thus the full quadrupolar tensor, of spin-3/2 nuclei at zero applied magnetic field. The first experiment is a simple nutation pulse sequence in which the first time period (t1) is the duration of the radiofrequency exciting pulse; and the second (t2) is the normal free-precession of a quadrupolar nucleus at zero-field. After double Fourier-transformation, the result is a 2 D spectrum in which the first frequency dimension is the nutation spectrum for the quadrupolar nucleus at zero-field. For polycrystalline samples this sequence generates powder lineshapes; the position of the singularities, in these lineshapes can be used to determine the asymmetry parameters η in a very straightforward manner, η has previously only been obtainable using Zeeman perturbed NQR methods. The second sequence is the same nutation experiment with a spin-echo pulse added. The virtue of this refocussing pulse is that it allows acquisition of nutation spectra from samples with arbitrary inhomogeneous linewidth; thus, asymmetry parameters can be determined even where the quadrupolar resonance is wider than the bandwidth of the spectrometer. Experimental examples of 35Cl, 81Br and 63Cu nutation and nutation-echo spectra are presented.

scholarly journals Measurement of the Noise Spectrum Using a Multiple-Pulse Sequence

2011 ◽  
Vol 107 (17) ◽  
Author(s):  
Tatsuro Yuge ◽  
Susumu Sasaki ◽  
Yoshiro Hirayama
Keyword(s):  
Pulse Sequence ◽  
Noise Spectrum ◽  
Multiple Pulse
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