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- W2004187789 abstract "Measurements of proton magnetic spin-lattice relaxation times T1 are reported for liquid solutions of anhydrous HBr in DBr, under their own vapor pressure, over the entire liquid range and slightly above the critical temperature. Our previous measurements of proton T1 for liquid solutions of anhydrous HCl in DCl at low temperatures are revised and reinterpreted. The proton relaxation includes contributions from intra- and intermolecular nuclear dipole-dipole interactions and spin-rotational interaction. The various contributions to the relaxation rate T1−1 have been separated by a graphical method, using the values of molecular reorientation correlation times τd, determined for HCl and HBr from chlorine nucleus and deuteron resonance, respectively. The analysis allowed the determination of the spin-rotation correlation times τsr and gave an estimate of the self-diffusion coefficients D for the liquids. It is found for HBr that τsr increases linearly with temperature and becomes almost equal to τd at the critical temperature. In contrast, τsr for HCl remains constant up to about −50°C and then increases with temperature and is proportional to T3 above 0°C; τsr is approximately equal to τd at the critical temperature as for HBr. Neither the magnitude nor the temperature dependence of the product τdτsr corresponds to I0/6kT. The values of D estimated for liquid HCI are, except for the lowest temperatures, in reasonable agreement with those measured by O'Reilly and also with those calculated from the cubic cell model of Houghton. By analogy with HCl, values of D are estimated for liquid HBr and are also compared with those obtained from the model; the agreement is satisfactory except at high temperatures. The results for τsr and D suggest a significant degree of hydrogen bonding in liquid HCl at low temperatures." @default.
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- W2004187789 date "1972-04-01" @default.
- W2004187789 modified "2023-09-23" @default.
- W2004187789 title "Nuclear spin relaxation and molecular motion in liquid HBr and HCl" @default.
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- W2004187789 doi "https://doi.org/10.1016/0022-2364(72)90164-3" @default.
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