Abstract
By adopting the phase convention of Condon and Shortley for spherical harmonics, it is shown how to determine in a standard way phases for electronic wave functions of a diatomic molecule. The method proposed is compared with the united atom method. On the basis of the phase convention introduced, the inversion eigenvalue of a non-$\Sigma$ state in a diatomic molecule is expressed in terms of quantum numbers characterizing the state in question. The inversion eigenvalue expressions are used to give an extended definition of Mulliken's c and d notation.
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