Abstract
Raman spectra of stilbene mono- and di-negative ions in tetrahydrofuran solution were obtained by Ar + laser exciting lines. A considerable frequency shift was observed for several vibrations in the successive steps: stilbene → (stilbene) − → (stilbene) 2−. The observed shift is discussed in a simple VB scheme, particularly in comparison with the results on anthracene negative ions. The resonance Raman effect was striking for both ions with intensity maxima at the exciting wavelengths close to the absorption maxima.
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