Transmission matter/radiation interactions

As noted earlier, the transmission of radiation in matter can be pictured as a momentary retention of the radiant energy by atoms, ions, or molecules folk)wed by reemission of the radiation in all directions as the particles return to their original state. With atomic or molecular particles that are small relative to the wavelength of the radiation, destructive interference removes most but not all of the reemitted radiation except the radiation that travels in the original direction of the beam the path of the beam appears to be unaltered as a consequence of the interaction. Careful observation, however, reveals that a very small fraction of the radiation is transmitted at all angles from the original path and that the intensity of this scanered radiation incretises with panicle size. 

Spectroelectrochemistry, reflection mode — The interaction of electromagnetic radiation with matter (-> spectroscopy) may occur by absorption or scattering when radiation impinges on matter or passes through matter. In the latter case (transmission mode) the radiation before and after passage is evaluated in order to obtain the desired spectrum. In studies of opaque materials or of surfaces interacting with matter inside the (bulk)... 

Spectroscopy is in general terms the science that deals with the interaction of electromagnetic radiation with matter in particular, it can be said to be the investigation of the optical properties, i. e. the transmission or reflection, of a sample within a certciin spectral range. These properties are studied as a function of the wavelength or frequency of the incident electromagnetic radiation. The spectral range mainly under consideration here is the infrared. 

Transmission, in which there is no significant interaction between radiation and matter, and the photon continues moving with its original energy and trajectory... 

Interaction between Matter and Infrared Radiation 341 Tab. 10.8 Transmissivity of selected materials. 

Matter interacts with incident electromagnetic radiation by the three distinct processes of transmission, scattering, or absorption. The nature of any interaction is a function of the properties of the radiation, such as energy, phase, polarization, and the chemical properties of the matter under... 

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