J. Phys. IV France
Volume 10, Numéro PR7, May 2000
International Workshop on Dynamics in Confinement
Page(s) Pr7-137 - Pr7-141
International Workshop on Dynamics in Confinement

J. Phys. IV France 10 (2000) Pr7-137-Pr7-141

DOI: 10.1051/jp4:2000727

Orientational ordering in methane condensates in mesoporous SiO2 modifications at low temperatures

B. Asmussen1, D. Balszunat1, C. Gutt1, W. Press1, W. Langel2, G. Coddens3 and R. Kahn3

1  Institut für Experimentelle und Angewandte Physik, Universität Kiel, Olshausenstr. 40, 24098 Kiel, Germany
2  Institut für Physikalische Chemie, Universität Greifswald, Soldtmannstr. 23, 17487 Greifswald, Germany
3  Laboratoire Léon Brillouin, Centre d'Études de Saclay, 91191 Gif-sur-Yvette, France

The rotational spectra of CH4 at low temperatures have been used to investigate the disordering influence of a restricted geometry on the orientational structure of methane condensates in silicagels and Controlled Pore Glasses. A cross-over from complete orientational disorder to the partially ordered phase II of pure methane was observed with increasing pore diameter d at ≈ 120 Å.

© EDP Sciences 2000