Optic-type Vibrational Modes of Liquid Chalcogens

Article type: Research Article

Authors: Chiba, Ayano | Ohmasa, Yoshinori | Yao, Makoto | Bennington, Stephen M.

Affiliations: Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan | ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 OQX, UK

Note: [] Corresponding author. Tel./Fax: +81-75-753-3780. E-mail: ayano@scphys.kyoto-u.ac.jp

Abstract: We carried out inelastic neutron scattering (INS) measurements to study the dynamic structure of liquid (l-) Se and Te50Se50. The bond-stretching modes for both liquids were found to lie in higher energies than those forming a trigonal phase, showing that the chainlike molecules are more isolated than in the trigonal phase. The Q-dependence of the intensity of the dynamic structure factor was examined at the region of the stretching modes, and found to be explained by a simple model where we assumed completely out-of-phase motions of two atoms. The result shows the possibilities of extracting short-range structural information from such Q-dependences for these kinds of basically isolated molecules.

Keywords: Liquid chalcogens, Selenium, Tellurium, Inelastic neutron scattering, Optic-type mode, Dynamic structure factor

DOI: 10.1080/10238160412331299483

Journal: Journal of Neutron Research, vol. 12, no. 4, pp. 301-304, 2004