title: Temperature dependence of the dielectric permittivity of CaF(2), BaF(2) and Al(2)O(3): application to the prediction of a temperature-dependent van der Waals surface interaction exerted onto a neighbouring Cs(8P(3/2)) atom.
abstract: The temperature behaviour in the range 22-500 °C of the dielectric permittivity in the infrared range is investigated for CaF(2), BaF(2) and Al(2)O(3) through reflectivity measurements. The dielectric permittivity is retrieved by fitting reflectivity spectra with a model taking into account multiphonon contributions. The results extrapolated from the measurements are applied to predict a temperature-dependent atom-surface van der Waals interaction. We specifically consider as the atom of interest Cs(8P(3/2)), the most relevant virtual couplings of which fall in the range of thermal radiation and are located in the vicinity of the reststrahlen band of fluoride materials.
authors.affiliation: Laboratoire de Physique des Lasers, UMR 7538 du CNRS et de l'Université Paris 13, 99 Avenue JB Clément, Villetaneuse, France.
authors.forename: Thierry
authors.initials: T
authors.lastname: Passerat de Silans
authors.forename: Isabelle
authors.initials: I
authors.lastname: Maurin
authors.forename: Pedro
authors.initials: P
authors.lastname: Chaves de Souza Segundo
authors.forename: Solomon
authors.initials: S
authors.lastname: Saltiel
authors.forename: Marie-Pascale
authors.initials: MP
authors.lastname: Gorza
authors.forename: Martial
authors.initials: M
authors.lastname: Ducloy
authors.forename: Daniel
authors.initials: D
authors.lastname: Bloch
authors.forename: Domingos
authors.initials: D
authors.lastname: de Sousa Meneses
authors.forename: Patrick
authors.initials: P
authors.lastname: Echegut