The discussion centers on the rules governing electromagnetic (EM) radiation crossover materials, specifically the interaction of infrared radiation with different substances. Key factors include the relationship between the wavelength of EM radiation and the molecular structure of materials. Infrared radiation can penetrate concrete due to its phonon modes, while metals, which exhibit collective behavior from conduction electrons (plasmons), prevent light penetration. Understanding these principles is crucial for applications in material science and engineering.
PREREQUISITESMaterial scientists, physicists, engineers, and anyone interested in the interaction of electromagnetic radiation with different materials.
live4physics said:Anybody knows if there is a rule for EM radiation cross over materials ?
The wavelength in comparison the size (or structure) of molecule is determinant ?
Ex. why infrared pass through the concrete but not metalics ?
Thank you.
ZapperZ said:You may want to read our FAQ in the General Physics forum first, especially on the post on photon going through a material. Most of these properties are governed by what we call the "phonon" modes of the material, i.e. the lattice vibration modes. For metal, there is an added complication from the presence of the conduction electrons that creates additional collective behavior called the "plasmons".
Zz.