Neutron Brillouin scattering in simple liquids and the description of their collective dynamics

Article type: Research Article

Authors: Bafile, U. | Barocchi, F.^; | Demmel, F. | Formisano, F. | Guarini, E. | Sampoli, M.^; | Venturi, G.^;

Affiliations: CNR-ISC, Sezione di Firenze, I-50019 Sesto Fiorentino, Italy | Dipartimento di Fisica, Università di Firenze, I-50019 Sesto Fiorentino, Italy | CNR-INFM and CRS Soft, I-50019 Sesto Fiorentino, Italy | Institute Laue-Langevin, BP156, F-38042 Grenoble Cedex 9, France | CNR-INFM and CRS Soft, BP156, F-38042 Grenoble Cedex 9, France | Dipartimento di Energetica, Università di Firenze, I-50139 Firenze, Italy

Note: [] Corresponding author. CNR-Istituto dei Sistemi Complessi, Sez. di Firenze, via della Madonna del Piano, I-50019 Sesto Fiorentino–Firenze, Italy. Tel.: + 39-055-5225327. Fax: + 39-055-5225305. Email: [email protected]

Note: [] Present address: ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxfordshire, OX11 0QX, UK.

Abstract: A comparison of models traditionally used to describe the dynamic structure factor S(Q,ω) obtained from earlier and more recent inelastic scattering studies is briefly presented. The case of monatomic systems, mostly addressed so far, is extended to the more complex case of molecular liquids. As a significant test case, the results of a recent neutron experiment on liquid methane is discussed. The relevance of neutron investigations on molecular fluids, though at the cost of some extra complication, is confirmed by the available results.

Keywords: Neutron scattering, Liquids, Collective dynamics, Dynamic structure factor

DOI: 10.1080/10238160601049237

Journal: Journal of Neutron Research, vol. 14, no. 4, pp. 281-285, 2006