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

Abstract

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.