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The Reststrahlen effect (German: “residual rays”) is a reflectance phenomenon in which electromagnetic radiation within a narrow energy band cannot propagate within a given medium due to a change in refractive index concurrent with the specific absorbance band of the medium in question; this narrow energy band is termed the ''Reststrahlen band''. As a result of this inability to propagate, normally-incident Reststrahlen band radiation experiences strong-reflection or total-reflection from that medium. The energies at which Reststrahlen bands occur vary and are particular to the individual compound. Numerous physical attributes of a compound will have an effect on the appearance of the Reststrahlen band these include but are not limited to; phonon band-gap, particle/grain size, strongly absorbing compounds, compounds with optically opaque bands in the infrared. == Appearance == Reststrahlen bands manifest in diffuse reflectance infrared absorption spectra as complete band reversal, or in infrared emission spectra as a minima in emissivity. 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「Reststrahlen effect」の詳細全文を読む スポンサード リンク
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