Wavelength dependence of multiphoton absorption and dissociation of hexafluoroacetone

Abstract

Infrared multiphoton absorption and dissociation of CF₃COCF₃ have been found at frequencies down to 30 cm^–1 below the origin of the 971 cm^–1 band. This excitation can be assigned to consecutive direct two-photon absorptions to states not containing the 971 cm^–1 vibration. Within the 971 cm^–1 band, multiphoton absorption data suggest harmonic oscillator-like behaviour. The data are consistent with the assumption that the absorbed energy is largely localized in a few states only.