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The resonance Raman spectra of cyano‐and aquocobalamin have been obtained from aqueous solutions. In order to check the vibronic theory of Raman intensity in the rigorous resonance case, the excitation profile of the 1502 cm −1 vibration was measured and analyzed using a model of two displaced harmonic oscillators for the ground and the resonant electronic state. A very good agreement is shown between the calculated and the experimental values of both the excitation profile and the absorption spectrum. Information on the corrin ring symmetry and evaluation of the vibronic interaction energies have been obtained. The appearance of several overtones and combinations is also reported.
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Galluzzi et al. (1974) studied this question.
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