Short-time photodissociation dynamics of chloroiodomethane in solution from resonance Raman spectroscopy

Resonance Raman and preresonance Raman spectra of chloroiodomethane in cyclohexane solution have been obtained at excitation wavelengths of 282, 309, 320, 342, 355, and 532 nm. The 282 nm spectrum is in resonance with the directly dissociative A-state absorption band of chloroiodomethane. We observe a large degree of Raman intensity in the C-1 stretch overtone progression as well as combination bands of the C-Cl stretch mode with the C-1 stretch overtones indicating that most of the initial photodissociation dynamics in the Franck-Condon region involves the C-1 stretch motion as well as some C-Cl stretch motion.