Abstract We describe the results of Haman studies on C=C stretch modes in $\alpha$-ET3(ReO4)2 charge-transfer salt with the incident laser beam polarised perpendicular and parallel to the large flat face of plate-like crystal. We have assigned central C=C stretch mode at 1454 cm-1 and ring C=C stretch mode at 1470cm-1. The change in ring C=C stretch vibration was observed at the metal-insulator transition of $\alpha$-ET3(ReO4)2 on warming due to the distortion of the ET molecules.
Received: 19 November 1994
Accepted manuscript online:
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