A-band resonance Raman spectra and short-time photodissociation dynamics of trans 1-chloro-2-iodoethane in cyclohexane solution

Resonance Raman spectra of 1-chloro-2-iodoethane in cyclohexane solution are presented for three excitation wavelengths. The fundamentals, overtones and combination bands of the nominal CCCl bend (ν10), the nominal C–I stretch (ν9), and the C–Cl stretch (ν8) vibrational modes can account for most of the resonance Raman intensity. The resonance Raman spectra and associated short-time photodissociation dynamics of 1-chloro-2-iodoethane are compared with iodoethane and this suggests that the chloroethyl radical receives more internal excitation than the ethyl radical from the A-band photodissociation in as much as the initial dynamics determines the internal excitation of the alkyl radical photoproducts.