Abstract
Abstract The self-diffusion coefficients of liquid 6Li and 7Li have been measured using NMR spin echo techniques with pulsed gradients. In the experimental procedure, and in the sample preparation, particular attention has been paid to a relative, rather than to an absolute measurement. At 190 °C, the ratio of the self-diffusion coefficients is found to be D6 (x6 = 1) / D7 (x7 = 1) = 1.09 ± 0.06, in agreement with the square root of the mass ratio (m7-m6)1/2 = 1.08. In an atomic mixture of 80% 6Li and 20% 7Li, D6 (x6 = 0.8)/D7 (x6 = 0.8) = 1.0 3 ± 0.08 has been obtained
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