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.

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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