Interaction of Radiation with Matter: Absorption, Emission, and Lasers
In the preceding chapter we treated quantitatively the two major sources of incoherent radiation, thermal emitters and diffuse scatterers. Our treatment was very general, invoking only thermodynamic and statistical laws, and describing matter in terms of its absorptivity or reflectivity. We now treat in much more detail the interaction of radiation with matter, in particular, the absorption or emission of a photon, which we again specify as an increment of energy, hv, extracted or added to an electromagnetic field of frequency, v. Einstein, in a classic (but not classical) paper, (Einstein, 1917), placed an assembly of particles in equilibrium with the Planck radiation ...
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