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Abstract
The structure factor of liquid selenium has been measured at 265, 470 and 680°C over the range of the scattering vector from 0.5 to 30 A−1 by time-of-flight neutron diffraction using epithermal pulsed neutrons generated from a 300 MeV Tohoku University electron LINAC. The characteristic oscillation of the structure factor in a high scattering vector region can be well understood in terms of a free-rotating chain molecule with a bond length of 2.38 A and a bond angle of 103°. The mean length of chain molecules becomes shorter with increasing temperature. The nearest neighbour distance between inter-molecular atoms in liquid selenium is estimated as about 3.4 A, which is close to the corresponding value in the crystalline state.
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