Abstract
The spin-lattice relaxation times of tetramethylammonium bromide (CH3)4NBr , iodide (CH3)4NI, tetraethylammonium chloride (CH3CH2)4NCl, bromide (CH3CH2)4NBr, iodide (CH3CH2)4NI , tetrapropylammonium iodide [CH3(CH2)2]4NI, tetrabutylammonium bromide [CH3(CH2)3]4NBr, iodide [CH3(CH2)3]4NI, tetraheptylammonium bromide [CH3(CH2)6]4NBr and iodide [CH3(CH2)6]4NI were measured at 60 MHz in the temperature interval 100 K to near the melting points. Two minima of T1 were observed for tetramethylammonium halides, for tetraethylammonium bromide and iodide and for tetrapropylammonium iodide. The minima in T1 were attributed to CH3 group reorientations and reorientations of the tetramethyl, ethyl and propylammonium cations. The activation energies of the processes were determined
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