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- W1970767650 abstract "The effect of partial isotopic substitution on Jahn-Teller spectra is systematically analyzed, taking the X 2E1g and B 2E2g degenerate electronic states of the benzene cation as representative examples. The electronic-vibrational coupling constants for the X and B states of 1,4-C6H4D+2 are derived from existing ab initio beyond-Hartree-Fock energy gradients with respect to symmetry coordinates of C6H6, using the C6H6 → C6H4D2 normal-mode scrambling matrix derived from the harmonic force field of benzene. The vibronic dynamics in the X and B states of 1,4-C6H4D+2 is treated with the inclusion of up to five nonseparable degrees of freedom. The model spectra reveal a variety of isotopic substitution effects on Jahn-Teller spectra, such as the lifting of Jahn-Teller degeneracies, the breaking of Jahn-Teller selection rules associated with the conservation of vibronic angular momentum, as well as the nonseparability of Jahn-Teller active and progression-forming vibrational modes in systems of reduced nuclear symmetry. It is demonstrated that the consistent inclusion of all active vibrational degrees of freedom is essential for the prediction of isotopically induced line-splitting effects in Jahn-Teller spectra. For the X 2E1g and B 2E2g states of 1,4-C6H4D+2 a splitting of the origin line of the order to 10 and 100 cm−1, respectively, is predicted." @default.
- W1970767650 created "2016-06-24" @default.
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- W1970767650 date "1992-06-01" @default.
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- W1970767650 title "Perturbation of the Jahn-Teller effect by partial isotopic substitution: multi-mode vibronic coupling in the X 2E1g and B 2E2g states of 1,4-C6H4D+2" @default.
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- W1970767650 doi "https://doi.org/10.1016/0301-0104(92)80147-n" @default.
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