Abstract

For several β- and κ-phase salts of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF or simply ET) and its deuterium analog <i>d</i>₈-ET, microreflectance infrared spectra were obtained by employing polarized and unpolarized light, and their vibronic regions were examined. These salts exhibit a strong vibronic absorption under polarized light. The vibronic absorption of the β-phase salts has a much stronger polarization-dependency than that found for the κ-phase salts. For the β-phase salts, the optimum vibronic absorption occurs when the polarized light vector is parallel to their donor-molecule stacking direction. Among the ET salts without structural disorder, the highest C-C-H bending frequency for the superconductors is lower than ~1320 cm⁻¹ while that for the non-superconductors is higher than ~1320 cm⁻¹.

Third-order nonlinear optical properties of new bisdithiafulvenyl-substituted tetrathiafulvalene

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P. P. Sethna, H. D. Downing, Lary W. Pinkley, and Dudley Williams
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Electronic and nuclear contributions to the third-order nonlinear optical susceptibilities of new p-N, N^?-dimethylaniline tetrathiafulvalene derivatives

B. Sahraoui, X. Nguyen Phu, M. Sallé, and A. Gorgues
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Jack I. Morrow and Amos Turk
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