Abstract
A semi-empirical definition method of the dependence of electronic moment on internuclear separation in diatomic molecules is presented. The calculation has two stages. In the first stage the matrix element of the electronic transition moment over vibrational wavefunctions is calculated analytically by the stationary-phase method. As a result, the band strength is expressed as a sum taken over the vibrational quantum number of the electronic transition moment. In the second stage the coefficients of the expansion of the electronic transition moment in real internuclear separations are obtained by the least-squares method. The suggested method avoids the weaknesses of the r-centroid method. As an example of this method, the calculation of the electronic transition moment of the Meinel band system of N2+ is given.
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