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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.
Reststrahlen bands manifest in diffuse reflectance infrared absorption spectra as complete band reversal, or in infrared emission spectra as a minima in emissivity.
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