Abstract
Polarized two-photon fluorescence excitation spectra were obtained for indole, 5-methylindole, 3-methylindole and 2,3-dimeth-ylindole in cyclohexane and butanol solutions. The polarization ratios clearly indicate the onset of L a absorption and directly verify established models regarding the relative response of L a and L b state energies to substitution and solvent perturbations (prior to excited-state relaxations). The two-photon properties are successfully modeled by INDO/S CI computation.
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