The theory of IR reflection and transmission

The reflection and refraction of electromagnetic radiation at an interface can be discussed with relation to Fig. 2. The incident, reflected, and refracted rays are shown in this figure as I, R, and T and reflection and transmission coefficients can be derived straightforwardly from standard electromagnetic theory. In order to focus our ideas and to define the convention used in this section, we may write down the expression for the electric field, E, of the radiation, assuming that the light is propagating in the z direction (with unit vector ) and the electric field is oriented in the x direction (with unit vector 

COATED PRISMS FT1R, OR dispersive with lock-ln technique 

Virtually any electrochemical reaction providing there Is a change In dipole moment over AE  

In addition to the refractive index, which is, of course, a function of the frequency of the incident radiation, we may also define the dielectric function of the medium in fact 

The changes that occur are best understood in terms of the energy flow associated with the radiation. In general, this is given by the corresponding Poynting vector of the light, S, defined by 

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