Abstract
A mixed dipole length-dipole velocity expression for the oscillator strength of an electronic transition is shown to be rather less sensitive to ground state correlation effects than are the ordinary dipole length and dipole velocity formulae. Similar considerations for rotatory strengths show that, in certain, symmetry favoured, cases the results of the dipole length expression are likewise significantly less affected by ground state correlation than are the results of the dipole velocity expression. Some comments are made on the importance of correlation errors in the excited states.
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