Polarized dye laser two-photon excitation spectra are reported for the following series of 0,0′-bridged biphenyls: fluorene, dibenzofuran, dibenzothiophene, carbazole, and phenanthrene. Two-photon polarization selection rules are used to assign the peaks observed. Several new states are reported and a number of tenuous assignments in the literature are confirmed. The spectra of the bridged compounds are compared with the biphenyl two-photon spectrum.
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Drucker et al. (1974) studied this question.
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