| Popis: |
Experimental data on the temperature dependence of the spin—lattice and spin—spin relaxation times of 35Cl nuclei in 4-chlorobenzyl chloride are interpreted by assuming that at a critical temperature, the relaxation mechanisms become more effective. This feature is related to the occurrence of semi-external molecular motions. From the view-point of NQR measurements they behave as internal molecular motions at low temperatures but as external ones at higher temperatures. This effect, which has already been detected in some other substituted benzenes, seems to occur in compounds whose molecules have characteristics geometry and weights. |
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