Two-photon absorptivities of the all t r a n s α, ω-diphenylpolyenes from stilbene to diphenyloctatetraene via three wave mixing

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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‐diphenyl‐ethylene, ‐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 (2?, cm−1), are as follows: stilbene, 12.1(0.9) at 38 873 cm−1, diphenylbutadiene, 14.4 (2.0) at 32 900 cm−1, diphenylhexatriene, 43.4 (4.0) at 32 900 cm−1, and diphenyloctatetraene, 61.0 (23.0) at 32 900 cm−1. Numbers in parentheses are standard deviations.