TWO-PHOTON EXCITATION SPECTRUM OF $PERYLENE^{*}$
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Date
1983
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Ohio State University
Abstract
The two-photon excitation technique is being applied to fluorescent, centrosymmotric polycyclic hydrocarbons and heteronuclear aromatics. We report here TPE spectra of perylene $(C_{20}H_{12}$, peri-dinaphthalene), which has $D_{2h}$ symmetry. Both $A_{g}$ and $B_{g}$ excited electronic states - which are ``hidden"" in the normal absrption spectrum-are revealed in the 250-400 nm region when $\sim 10^{-4}$ M solutions of parylene in n-octane are irradiated by near infrared light from a tunable Nd: YAG-pumped dye laser. Assignments are based on the relative intersity of the two-photon anduced fluerescence under linear and circular polarization of the laser soures. The experimentally-determined excited state energies will be compared with published theoretical $calculations.^{1}$ $^{*}$Research supported in part by the U. S. National Science Foundation. $^{1}$Y. Tanizaki, T. Yoshinaga and H. Hiratsuka, Spectroship Acta 34A, 205 (1978).
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Author Institution: Department of Chemistry, Michigan state University