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Nonlinear Spectroscopy In Polydiacetylenes
Published 1987 · Chemistry
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Abstract Wave dispersed third harmonic generation (THG) and electric field induced second harmonic generation (EFISHG) measurements of cubic susceptibilities x 3 (−3ω;ω,ω,ω) and x 3 (−2ω;ω,ω,o) in thin polydiacetylenic films are reported. Two and three photon resonances, different for these two hyperpolarizabilities, are observed in 0,8 – 2 μm wavelength range. This is interpreted in terms of quantum mechanical formulas involving allowed (u) and forbidden (g) excited states. For the “blue” and “red” forms studied the “g” excited states are located 800 cm −1 and 2500 cm −1 below the first “u” excited state.