Abstract
Thermal reactions accompanied by emission of light (UV-Vis, IR, radio waves) are briefly reviewed. The Boltzmann law requires that molecules (atoms, ions, radicals, radical-ions) have distribution of energy levels according to the exponential law. Criteria for observation of emission of light quanta are presented. The well-known example is chemiluminescence, where a thermally “hot” molecular product returns to the ground state emitting light. Other types of similar reactions are presented. The observation of microwave emission is discussed.
Keywords: Exothermic chemical reactions, electronically excited states, vibrational excitation, chemiluminescence, emission of UV-Vis, IR and radio waves.
Graphical Abstract
[http://dx.doi.org/10.1142/5316]
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