Absolute intensity of a Raman line which is proportional to the square of the derivative of molecular polarizability has been determined from the delta-function potential model yielding theR4-dependence of the bond parallel component of the polarizability. The delta-function potential model has been used to derive the expression for the derivative of the mean molecular polarizability with respect to a change in the internuclear distance at the equilibrium configuration for many diatomic molecules, and for the symmetrical stretching modes of many polyatomic molecules and ions in the ground electronic state. The computed polarizability derivatives are in good agreement with most of the experimental ones derived from Raman intensities. Bond orders have been computed from the experimental polarizability derivatives for various ionic systems through the use of the delta-function potential model, and the results have been discussed in relation to the contributions of the π and σ electrons to the polarizability derivatives of multiple bond
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