Molecular dynamics in liquid cyclopropane - I. — Self-diffusion Measurements by Quasielastic Neutron Scattering and N.M.R. Spin Echo

The translational diffusion of liquid cyclopropane was studied by quasielastic neutron scattering (Q.N.S.) and by N.M.R. spin-echo in the temperature range 155-297 K. The values of the self-diffusion coefficient derived from the two techniques was the same within experimental accuracy (D = 0.78 x 10-5 cm2 s-1 at 155 K, and D = 9.2 x 10-5 cm2 s-1 at 297 K). This shows that high-resolution Q.N.S. measurements at small momentum transfer give accurate information in the hydrodynamic region.