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VOLUME 29 (1979) | ISSUE 8 | PAGE 453
Vibronic structure in the spectra of two-photon absorption of organic dye solutions
The vibronic structure was recorded for the first time in the two-photon absorption (TPA) spectra of molecular solutions of organic dyes at room temperature. We conclude that the appearance of structure in the TPA spectra and the absence of such structure in the one-photon absorption spectra is attributable to preferential excitation of certain asymmetric molecular vibrations due to two-photon absorption.