Activation process model: Einstein coefficients for activation barrier

Analytical calculation of Einstein coefficients is made for activation barrier of the Boltzmann-Arrhenius model and an activation process model. For the activation process model an activation barrier is shown to have discrete energy structure due to its thermodynamic equilibrium with thermal radiation. This structure is determined by interaction of conformation substates of a molecule with thermal radiation. The Boltzmann-Arrhenius model represents an activation process as a result of the work of high-energy spectral components of thermal equilibrium radiation. The process is realized by overcoming a potential barrier with continuous energy structure. However, it is shown, that such process is essentially non-equilibrium and hard to achieve at thermal equilibrium radiation.