1. Laboratoire “Organisation Moléculaire. Evolution et Matériaux fluorés”, UMR CNRS/ Université Montpellier II No. 5073, F-34095 Montpellier Cedex 05, France
2. Complex Fluids Laboratory, CNRS−Cranbury Research Center Rhodia Inc., 259 Prospect Plains Road, Cranbury, New Jersey 08512
3. FOM-Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands