Optic-type Vibrational Modes of Liquid Chalcogens

Author: Chiba Ayano   Ohmasa Yoshinori   Yao Makoto   Bennington Stephen M.  

Publisher: Gordon and Breach

ISSN: 1023-8166

Source: Journal of Neutron Research, Vol.12, Iss.4, 2004-12, pp. : 301-304

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Abstract

We carried out inelastic neutron scattering (INS) measurements to study the dynamic structure of liquid ( l -) Se and Te 50 Se 50 . 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.