Abstract

Inelastic electron tunneling spectra of thin films of bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) and its salts: a low temperature superconductor κ-(BEDT-TTF) 2Cu(NCS) 2 and an insulator (BEDT-TTF) 2Mo 6O 19 are measured at 4.2 K in the range 230–1650 cm −1 and compared with infrared spectra of the same compounds at room temperature. The obtained vibrational bands are assigned following theoretical normal mode calculations. Electron-molecular vibration coupling theory of charge-transfer organic compounds is extended to the case of electron tunneling spectra.

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