Two-photon absorptivities of the all trans α, ω- diphenylpolyenes from stilbene to diphenyloctatetraene via three wave mixing

Abstract

Using the interference between the Raman resonances of the solvent and the two-photon absorption resonances of the solute in a three wave mixing experiment (CARS), we have extracted the absolute two-photon absorptivities at single energies for solution samples of the all-trans isomers of α, ω-diphenylethylene, -butadiene, -hexatriene, and -octatetraene. Their absorptivities, for two identical linearly polarized photons in multiples of 10-50 cm4 sec photon-1 molecule-1 at the appropriate total energies (2ν̄, cm-1), are as follows: stilbene, 12.1(0.9) at 38873 cm-1, diphenylbutadiene, 14.4 (2.0) at 32900 cm-1, diphenylhexatriene, 43.4 (4.0) at 32900 cm-1, and diphenyloctatetraene, 61.0 (23.0) at 32900 cm-1. Numbers in parentheses are standard deviations. © 1979 American Institute of Physics.