翻訳と辞書 Words near each other ・ Absorbing Markov chain ・ Absorbing set ・ Absorbing set (random dynamical systems) ・ Absorbing the Disarray ・ Absorptance ・ Absorption ・ Absorption (acoustics) ・ Absorption (chemistry) ・ Absorption (economics) ・ Absorption (electromagnetic radiation) ・ Absorption (logic) ・ Absorption (pharmacokinetics) ・ Absorption (psychology) ・ Absorption (skin) ・ Absorption band ・ Absorption cross section ・ Absorption edge ・ Absorption hardening ・ Absorption heat pump ・ Absorption law ・ Absorption of water ・ Absorption refrigerator ・ Absorption spectroscopy ・ Absorption unit ・ Absorption wavemeter ・ Absorptive capacity ・ Absorptive state ・ Absorptivity ・ Absouya Department ・ ABSS Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Absorption cross section ： ウィキペディア英語版 Absorption cross section Absorption cross section is a measure for the probability of an absorption process. More generally, the term cross section is used in physics to quantify the probability of a certain particle-particle interaction, e.g., scattering, electromagnetic absorption, etc. (Note that light in this context is described as consisting of particles, i.e., photons.) In the context of ozone shielding of ultraviolet light, absorption cross section is the ability of a molecule to absorb a photon of a particular wavelength and polarization. Analogously, in the context of nuclear engineering it refers to the probability of a particle (usually a neutron) being absorbed by a nucleus. Although the units are given as an area, it does not refer to an actual size area, at least partially because the density or state of the target molecule will affect the probability of absorption. Quantitatively, the number ''dN'' of photons absorbed, between the points ''x'' and ''x'' + ''dx'' along the path of a beam is the product of the number ''N'' of photons penetrating to depth ''x'' times the number n of absorbing molecules per unit volume times the absorption cross section σ: :$\backslash frac=\; -N\; n\; \backslash sigma$. The absorption cross-section is closely related to molar absorptivity and mass absorption coefficient. For a given particle and its energy, the absorption cross-section of the target material can be calculated from mass absorption coefficient using: :$\backslash sigma=\; (\backslash mu/\backslash rho)\; m\_a/N\_A$ where: * $\backslash mu/\backslash rho$ is the mass absorption coefficient * $m\_a$ is the atomic molar mass in g/mol * $N\_A$ is Avogadro's number and is the number of molecules per mole This is also commonly expressed as: :$\backslash sigma=\; \backslash alpha/N$ where: * $\backslash alpha$ is the absorption coefficient * $N$ is the atomic number density ==See also== *Cross section (physics) *Photoionisation cross section *Nuclear cross section *Neutron cross section *Mean free path *Compton scattering *Transmittance *Attenuation *Beer-Lambert law *High energy X-rays *Attenuation coefficient *Absorption spectroscopy 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Absorption cross section」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.