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    STUDIA PHYSICA - Ediţia nr.1 din 2006  
         
  Articol:   THE STUDY OF MOLECULAR MOVEMENTS IN BINARY LIQUIDS MIXTURES BY PROTON N.M.R RELAXATION.

Autori:  GHEORGHE CRISTEA, VIRGIL IONCU. 		 
       
         
  Rezumat:  In this paper the proton N.M.R. relaxation phenomenon has been used for studding the rotational and translational molecular movement in the following binary liquids mixture: isopropyl alcohol-CCl4, n-amyl alcohol-CCl4 and benzene-CCl4. All the three liquids, diluted in diamagnetic CCl4, contain protons and, therefore, excited by an electromagnetic radiofrequency pulse, give an N.M.R. signal which decays as a result of spin-lattice and spin-spin proton relaxation. The experiment consists in determination of T1 (the spin -lattice relaxation tine) and T2 (the spin-spin relaxation time) which are tight linked with rotational and translational molecular movements. We argued that in these mixtures only dipole-dipole, intra- and intermolecular, relaxation mechanism is effective. Separating, experimentally, the two dipole-dipole relaxation mechanisms we were able to determine rotational correlation time (R) and translational correlation time (D) of the molecular motion. Knowing these two parameters we determined the rotational diffusion coefficient (DR) and the translational diffusion coefficient (D) of alcohol and benzene molecules, respectively.  
         
     
         
         
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