doublet spectral
21Naine L — Une naine L est un astre de type spectral L, généralement de masse substellaire (naine brune ou de masse planétaire) ou parfois une étoile de très faible masse. Elle est plus froide qu une naine rouge (type spectral M) et plus chaude qu une naine …
22Diamond simulant — Due to its low cost and close visual likeness to diamond, cubic zirconia has remained the most gemologically and economically important diamond simulant since 1976. The high price of gem grade diamonds, as well as significant ethical concerns of… …
23NMR spectroscopy — Nuclear magnetic resonance spectroscopy, most commonly known as NMR spectroscopy, is the name given to a technique which exploits the magnetic properties of certain nuclei. This phenomenon and its origins are detailed in a separate section on… …
24fine structure — /fuyn/, Physics. a group of lines that are observed in the spectra of certain elements, as hydrogen, and that are caused by various couplings of the azimuthal quantum number and the angular momentum quantum number. Cf. hyperfine structure. [1915… …
25Fraunhofer lines — In physics and optics, the Fraunhofer lines are a set of spectral lines named for the German physicist Joseph von Fraunhofer (1787–1826). The lines were originally observed as dark features (absorption lines) in the optical spectrum of the… …
26LUMIÈRE - Dispersion et absorption — Suivant sa fréquence, un rayonnement électromagnétique interagit différemment avec la matière. Un des aspects de ce phénomène est la dispersion, c’est à dire la variation de l’indice de réfraction de la substance en fonction de la longueur d’onde …
27Nucleon — For the Ford concept car, see Ford Nucleon. For the fictional power source in the Transformers universe, see Nucleon (Transformers). An atomic nucleus is a compact bundle of the two types of nucleons: Protons (red) and neutrons (blue). In this… …
28Algorithmes Doppler — Les algorithmes Doppler désignent des processus automatiques de reconnaissance de certaines circulations dans les données des radars météorologiques. Dans et sous les orages, on peut avoir des rotations qui peuvent mener à des tornades. On a… …
29comet — cometary /kom i ter ee/, cometic /keuh met ik/, cometical, adj. cometlike, adj. /kom it/, n. Astron. a celestial body moving about the sun, usually in a highly eccentric orbit, consisting of a central mass surrounded by an envelope of dust and… …
30Nuclear magnetic resonance — This article is about the physical phenomenon. For its use as a method in spectroscopy, see Nuclear magnetic resonance spectroscopy. NMR redirects here. For other uses, see NMR (disambiguation). First 1 GHz NMR Spectrometer (1000 MHz,… …
