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Abstract
lt is shown that the parts of molecular spectral terms corresponding to electronic motion, nuclear rotational and nuclear vibrational energies may be obtained systematically as members of a power series development on the fourth root of the ratio between the electron mass and the average nuclear mass. Such procedure leads to rotational equations which represent a generalization of the Kramers and Pauli hypotheses (about a top with intrinsic angular momentum). Furthermore, justifications of the Franck and Condon considerations about the band intensities are given. This is shown for diatomic molecules.
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References
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