翻訳と辞書 Words near each other ・ Spectrum (Jega album) ・ Spectrum (magazine) ・ Spectrum (Montreal) ・ Spectrum (newspaper) ・ Spectrum (novel) ・ Spectrum (radio program) ・ Spectrum (Say My Name) ・ Spectrum (Steve Howe album) ・ Spectrum (topology) ・ Spectrum (TV channel) ・ Spectrum (Zedd song) ・ Spectral invariants ・ Spectral layout ・ Spectral leakage ・ Spectral line ・ Spectral line ratios ・ Spectral line shape ・ Spectral mask ・ Spectral method ・ Spectral modeling synthesis ・ Spectral Mornings ・ Spectral music ・ Spectral mutability ・ Spectral network ・ Spectral noise logging ・ Spectral phase interferometry for direct electric-field reconstruction ・ Spectral power distribution ・ Spectral printing ・ Spectral purity ・ Spectral pygmy chameleon 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 Spectral line ratios ： ウィキペディア英語版 Spectral line ratios The analysis of line intensity ratios is an important tool to obtain information about laboratory and space plasmas. In emission spectroscopy, the intensity of spectral lines can provide various information about the plasma (or gas) condition. It might be used to determine the temperature or density of the plasma. Since the measurement of an absolute intensity in an experiment can be challenging, the ratio of different spectral line intensities can be used to achieve information about the plasma, as well. == Theory == The emission intensity of an atomic transition from the upper state to the lower state is given in $erg/cm^3\; s$: $P\_\; =\; N\_u\; \backslash \; \backslash hbar\; \backslash omega\_\; \backslash \; A\_$ , where: * $N\_u$ is the density of ions in the upper state, * $\backslash hbar\; \backslash omega\_$ is the energy of the emitted photon, which is the product of Planck's constant and the transition frequency, * $A\_$ is the Einstein coefficient for the specific transition. The population of atomic states N is generally dependent on plasma temperature and density. Generally, the more hot and dense the plasma, the higher atomic states are populated. The observance or not-observance of spectral lines from certain ion species can, therefore, help to give a rough estimation of the plasma parameters. More accurate results can be obtained by comparing line intensities: $\backslash frac\}\; =\; \backslash frac\; A\_\; \}\; A\_\}$ , The transition frequencies and the Einstein coefficients of transitions are well known and listed in various tables as in NIST Atomic Spectra Database. It is often that atomic modeling is required for determination of the population densities $N\_$ and $N\_$ as a function of density and temperature. While for the temperature determination of plasma in thermal equilibrium Saha's equation and Boltzmann's formula might be used, the density dependence usually requires atomic modeling. 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「Spectral line ratios」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.