transition de vibration
41Raie zéro-phonon et bande satellite phonon — Figure 1. Représentation schématique du profil d une excitation électronique. La partie étroite à la fréquence ωˈ est la raie zéro phonon, la partie plus large est la bande satellite phonon. Les positions relatives des deux composantes lors d une …
42LUMINESCENCE — On appelle luminescence l’émission de tout rayonnement électromagnétique visible, ultraviolet ou infrarouge, qui n’est pas d’origine purement thermique. Des phénomènes de luminescence sont connus depuis des milliers d’années; on en trouve des… …
43Metal ions in aqueous solution — A metal ion in aqueous solution is a cation, dissolved in water, of chemical formula [M(H2O)n]z+. The solvation number, n, determined by a variety of experimental methods is 4 for Li+ and Be2+ and 6 for elements in rows 3 and 4 of the periodic… …
44Loi de Dulong et Petit — En thermodynamique, la loi de Dulong et Petit est une loi empirique qui stipule que la capacité calorifique molaire Cp des éléments solides est voisine de 3R, soit 25 J.K‑1.mol 1. Pour la plupart des éléments elle est assez bien vérifiée à… …
45Kinetic isotope effect — The kinetic isotope effect (KIE) is the ratio of reaction rates of two different isotopically labeled molecules in a chemical reaction. It is also called isotope fractionation, although this term is somewhat broader in meaning. A KIE involving… …
46crystal — crystallike, adj. /kris tl/, n., adj., v., crystaled, crystaling or (esp. Brit.) crystalled, crystalling. n. 1. a clear, transparent mineral or glass resembling ice. 2. the transparent form of crystallized quartz. 3. Chem., Mineral. a solid body… …
47Crystal — /kris tl/, n. 1. a city in SE Minnesota, near Minneapolis. 25,543. 2. a female given name. * * * I Any solid material whose atoms are arranged in a definite pattern and whose surface regularity reflects its internal symmetry. Each of a crystal s… …
48luminescence — luminescent, adj. /looh meuh nes euhns/, n. 1. the emission of light not caused by incandescence and occurring at a temperature below that of incandescent bodies. 2. the light produced by such an emission. [1885 90; < L lumin (see LUMEN) +… …
49Falsetto — The term falsetto (Italian diminutive of falso , false) refers to the vocal register occupying the frequency range just above the modal voice register and overlapping with it by approximately one octave. It is produced by the vibration of the… …
50Duct (HVAC) — A round galvanized steel duct connecting to a typical diffuser Fire resistance rated …
