IR ABSORPTION ANISOTROPY IN DIANHYDRIDE PERILEN-3,4,9,10-TETRACARBOXILIC ACID FILMS
<i>Vacuum deposited dianhydride perilen-3,4,9,10-tetracarboxilic acid thin films are investigated by a method of IR-spectropolarimetry with an incident angle of plane-polarized radiation varied. The anisotropy of absorption bands in the region of 700-900 cm</i><sup><i>-1 </i></sup><i>is detected and the absorption bands in the subregions of 728-736 and 806-810 cm</i><sup><i>-1</i></sup><i> are shown to be of triplet nature with orthogonal orientation of dipole moments within the triplet.</i>