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Abstract
Abstract The absorption spectra of I2 in solution in CCl4 and n-heptane are analyzed in terms of transitions from the ground state to the three electronically excited states (3Π1u, 1Π1u, 3Πu-u) of this molecule. Accordingly the experimental absorption profiles were successfully fitted to a sum of three gaussian profiles. The use of gaussian spectral profiles is justified by the simplified δ-reflection method, the participation of vibrationally excited ground-state levels and by non-linear shape of the solvent-dependent excited-state potential curves. The observed solvent-induced blue-shift of the overall absorption spectra is explained in terms of slight changes in the excited-state potential parameters and relative strong changes in the dipole transition moment. The temperature-dependent experimental results are consistent with the proposed model.
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