RAMAN INTENSITY OF DIOXANE AND PIPERAZINE BY THE MODIFIED MANY-BODY MODEL

The vibrational Raman intensities of dioxane and piperazine were analy sed on the basis of the modified many-body model, using atomic polariz abilities obtained from many-body interactions among induced dipoles o n atoms. The polarized Raman spectrum of dioxane was analysed satisfac torily, but not the depolarized spectrum. It is concluded that the ato mic polarizability used is suitable for explaining Raman intensities, especially for bending vibrations. Only bond stretch intensity paramet ers are needed in the bond polarizability description. The vibrational assignments of piperazine were also treated using the same force fiel d and the intensity parameters as in dioxane, adding some force consta nts for the NH groups.