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.
<p>A flauta é um instrumento musical classificado como instrumento de sopro. Dentre os diversos tipos, a flauta transversal tem esse nome devido ao sopro ser transversal ao comprimento da flauta. Neste artigo, analisamos o espectro sonoro desse tipo de flauta, identificamos os harmônicos mais intensos na formação do timbre do instrumento para diversas notas musicais da escala diatônica, e reproduzimos a forma da onda sonora resultante com base no espectro.</p>
Fluoride materials exhibit surface resonances located in the thermal infrared. This makes them interesting to search for a fundamental temperature dependence of the atom-surface interaction, originating in the near-field thermal emissivity of the surface. Preliminary selective reflection experiments performed on a special Cs vapour cell that includes a CaF 2 interface show a temperature dependence, yet to be analyzed. Sapphire 280 °C 300 °C 340 °C 100 MHz CaF 2
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