Structure factors of liquid and amorphous selenium were measured over a range of the scattering vector as wide as 0.5 to 30 A^ by means of time-of-flight neutron diffraction using hot pulsed neutrons generated by an electron LINAC. Based on experimental observation of the structure factor in the high-scattering-vector region which is mainly attributed to the intramolecular correlation, a disordered-chain model which has both helical- and ring-type arrangements in a single molecule has been proposed for the structure of the molecule in liquid and amorphous selenium
