Spectroscopic manifestation of the accidental degeneracy of π=Δ electronic adiabatic terms of linear triatomic systems
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The semiclassical form of the absorption band of a linear triatomic system which corresponds to an electronic transition from the Σ-ground state term to the excited intersection π and δ terms was calculated. The analysis was carried for negligibly small defect of frequencies and in the absence of a shift of the equilibrium position on excitation. The experimentally observed CuCl2 absorption spectrum was interpreted qualitatively as a π, Δ ← gS transition on the existence of a point of π=Δ accidental degeneracy. The 7000–24000 cm−1 energy interval in the spectrum was analyzed.
KeywordsAbsorption Spectrum Absorption Band Electronic Transition CuCl2 Equilibrium Position
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