Abstract

Metallized pyridyl azonaphthol dyes show a well-resolved vibronic manifold in the absorption spectra of their main hue band. The vibrations and groups causing this vibronic activity were investigated by resonance Raman spectroscopy, absorption spectroscopy, and molecular orbital calculations. Resonance Raman intensity enhancements of up to 5 × 10⁴ were observed, and all of the major group vibrations were strongly enhanced. Consequently, we have concluded that the resolvable vibronic manifold has its origin in several group vibrations.

Stimulated-emission pumping spectroscopy of highly excited states of CH₃O(X˜E2): zero-order vibrational states at 3000 cm⁻¹ ≤ 9000 cm⁻¹

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