scholarly journals Model – free approach to quadrupole spin relaxation in solid 209Bi-aryl compounds

2018 ◽  
Vol 20 (36) ◽  
pp. 23414-23423 ◽  
Author(s):  
Danuta Kruk ◽  
Christian Goesweiner ◽  
Elzbieta Masiewicz ◽  
Evrim Umut ◽  
Carina Sampl ◽  
...  
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Quadrupole Spin ◽  
Model Free ◽  
Quadrupole Resonance ◽  
Model Free Approach ◽  
Nuclear Quadrupole

Nuclear Quadrupole Resonance (NQR) experiments were performed for deuterated and non-deuterated triphenylbismuth (BiPh3) to inquire into 209Bi relaxation mechanisms.

Square wave frequency modulation in pure nuclear quadrupole resonance spectroscopy

1973 ◽  
Vol 26 (8) ◽  
pp. 1611 ◽  
Author(s):  
RA Caldwell
Keyword(s):  
Relaxation Time ◽  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Modulation Frequency ◽  
Spin Relaxation Time ◽  
Resonance Spectroscopy ◽  
Nuclear Quadrupole Resonance Signal ◽  
Square Wave ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

The effect of square wave modulation frequency on the signal intensities obtained with a super-regenerative spectrometer is investigated. The dependence of the nuclear quadrupole resonance signal intensity obtained with a number of compounds is found to be related to the apparent spin-spin relaxation time of the resonant nuclei. An analysis indicates that the signal response of the resonant nuclei is the same regardless of modulation frequency. However, the fundamental Fourier component is directly related to the apparent spin-spin relaxation time.

scholarly journals Measurement of Apparent Spin?Spin Relaxation Times in Nuclear Quadrupole Resonance Using a Double Pulsed Super-regenerative Oscillator

1975 ◽  
Vol 28 (1) ◽  
pp. 45 ◽  
Author(s):  
KR Doolan ◽  
S Hacobian
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Mathematical Analysis ◽  
Relaxation Times ◽  
Modes Of Operation ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
T Values

A super-regenerative oscillator has been used to obtain apparent spin-spin relaxation times n for nuclear quadrupole resonance signals from some polycrystalline compounds. A mathematical analysis is given to show how T~ values may be obtained from a double pulsed super-regenerative oscillator for both logarithmic and linear modes of detection; each of these modes is described. Results obtained from both modes of operation are examined.

Cl35spin-spin relaxation timeT2inRb2ZnCl4studied by nuclear quadrupole resonance

1990 ◽  
Vol 41 (10) ◽  
pp. 6213-6219 ◽  
Author(s):  
G. Papavassiliou ◽  
F. Milia ◽  
E. Giannakopoulos
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Impurity effects on the apparent spin-spin relaxation times of 35Cl nuclear quadrupole resonance in some solid mixtures

1975 ◽  
Vol 28 (7) ◽  
pp. 1439 ◽  
Author(s):  
KR Doolan ◽  
S Hacobian
Keyword(s):  
Relaxation Time ◽  
Nuclear Quadrupole Resonance ◽  
Spin Relaxation ◽  
Relaxation Times ◽  
Electric Quadrupole ◽  
Impurity Effects ◽  
Dipole Interactions ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole ◽  
35Cl Nuclear Quadrupole Resonance

Various monosubstituted and disubstituted benzenes were mixed in varying amounts with p-dichlorobenzene to form solid mixtures. The apparent spin-spin relaxation time, T*2, of the 35Cl nuclear quadrupole resonance of each of these mixtures was determined by a double pulsed super-regenerative oscillator (SRO) method which has been described previously.1 The SRO was operated in the logarithmic mode. The results show that electric quadrupole rather than magnetic dipole interactions are mainly responsible for the broadening that was observed for the 35Cl n.q.r. line of p-dichlorobenzene due to the impurities. The results also indicate that the para-disubstituted benzenes used formed uniform solid solutions with p-dichlorobenzene over the concentration range studied.

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