Abstract
Comparison of Raman spectra of WO 3 and Na 0.1WO 3 excited with 647- and 488-nm radiation shows preresonance Raman enhancement of overtone intensity in a WO stretching mode for Na 0.1WO 3 under 647-nm excitation. This observation supports the idea that electrons are trapped in polaronic states in the low x sodium tungsten bronzes.
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