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The third-order nonlinear-susceptibility χ⁽³⁾(-2{ω};{ω},{ω},0) spectrum has been investigated for thin films of linear-Si-chain compounds, poly(dihexylsilane), by measurements of electric-field-induced second-harmonic generation (EFISHG). In the χ⁽³⁾ spectrum for EFISHG, two-photon resonance structures to the first and second levels of one-dimensional excitons were observed. The observed χ⁽³⁾ spectrum can be accounted for by considering multiple optical processes in the one-dimensional excitonic series characteristic of the Si-chain system.
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Kishida et al. (1994) studied this question.
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