Dye laser two-photon excitation study of several 0,0′-bridged biphenyls

Abstract

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.