HIGHER EXCITED-STATES OF AROMATIC-HYDROCARBONS .3. ASSIGNING THE INPLANE POLARIZED TRANSITIONS OF LOW-SYMMETRY MOLECULES - CHRYSENE AND E-STILBENE

The polarization of the UV and near VUV bands of chrysene and E-stilbe ne have been measured up to 70000 cm-1. The high natural polarization of the synchrotron radiation was used in combination with matrix-isola tion to perform photoselection experiments. The limits of the of photo selection technique in connection with low symmetry molecules are disc ussed. Comparison with existing data for the low energy region (nu les s-than-or-equal-to 50000 cm-1) confirms the applicability of the photo selection technique to determine electronic transition moment directio ns in low-symmetry molecules. CNDO/S-SDCI results allow a consistent a ssignment of the whole energy region up to the experimental limit of a bout 70000 cm-1.