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Vibrational Excitons, Resonant Energy Transfer, And Local Structure In Liquid Benzene, Richard Alan Lesar, R. Kopelman

Richard Alan Lesar

The presence of vibrational excitons in liquid benzene has been tested by the method of isotopic dilution. A C6H6/C6D6 concentration study on the infrared and Raman fundamental modes reveals that the umbrella (A 2u ) vibrational exciton in solid benzene retains its characteristics upon melting and at room temperature. The total liquidexciton bandwidth is about 40 cm−1, practically the same as in the solid. This indicates an instantaneous local liquid structure similar to that of the solid (the C i crystal site symmetry is also nearly preserved), in general agreement with indications from other methods. The fastest nearest neighbor vibrational …