Double resonance detection of 17O quadrupole resonance in potassium bicarbonate

1981 ◽  
Vol 77 (5) ◽  
pp. 761 ◽  
Author(s):  
Ian J. F. Poplett ◽  
John A. S. Smith
Keyword(s):  
Double Resonance ◽  
Potassium Bicarbonate ◽  
Quadrupole Resonance ◽  
Resonance Detection

Double Resonance Detection Using Zero Field Level Crossing

1998 ◽  
Vol 53 (6-7) ◽  
pp. 301-304
Author(s):  
David Stephenson ◽  
John A. S. Smith
Keyword(s):  
High Frequency ◽  
Asymmetry Parameter ◽  
Double Resonance ◽  
Zero Field ◽  
Level Crossing ◽  
Small Magnetic Field ◽  
Crossing Experiment ◽  
Quadrupole Resonance ◽  
Simple Variation ◽  
Resonance Detection

Abstract Double resonance level crossing detection cannot normally be used to record transitions between the quadrupole Zeeman levels. Neither can it be used if the quadrupole resonance frequency is larger than the proton NMR frequency in high field. A simple variation of the level crossing experiment is demonstrated which allows energy to be efficiently transferred from quadrupole to proton system and hence lead to detection in these two cases. In the case of the quadrupole Zeeman levels it allows transitions between the ±½ levels to be detected in a small magnetic field, allowing measurement of the asymmetry parameter (ƞ) for spin 3/2 systems. This is demonstrated for the 11B nucleus in triethanolamine borate. Detection of high frequency quadrupole transitions is demonstrated from which relaxation information is obtained.

New Methods of Nuclear Quadrupole Resonance

1990 ◽  
Vol 45 (3-4) ◽  
pp. 559-564 ◽  
Author(s):  
V. S. Grechishkin
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Double Resonance ◽  
Rf Pulses ◽  
The Past ◽  
New Methods ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract New NQR methods, developed over the past years, are discussed: 1. Two frequency NQR double resonance, 2. the influence of strong off-resonance combination of rf pulses on demagnetized state in NQR, 3. remote NQR.

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