RAMAN POLARIZABILITY FOR SOME TOTALLY SYMMETRICAL NORMAL VIBRATIONS OF NAPHTHALENE AND MALEIC-ANHYDRIDE

The values of the Raman polarizability of some totally symmetric norma l vibrations of naphthalene and maleic anhydride were estimated from t he analysis of the polarized Raman spectra observed in single crystal. For the totally symmetric ring vibrations of naphthalene the principa l elements of the Raman polarizability in the molecular plane are abou t isotropic and the principal element perpendicular to the molecular p lane has the value almost one-half of the values of the in-plane eleme nts. For the totally symmetric C=O and C=C stretching vibrations of ma leic anhydride the Raman polarizability shows quite anisotropic charac ter.