Resonance Raman Study of Short-Time Photodissociation Dynamics of the Charge-Transfer Band Absorption of Nitrobenzene in Cyclohexane Solution

摘要

Resonance Raman spectra were obtained for nitrobenzene in cyclohexane solution with excitation wavelengths in resonance with the charge-transfer (CT) band absorption spectrum.These spectra indicate that the Franck- Condon region photodissociation dynamics have multidimensional character with motion mainly along the nominal NO_2 symmetric stretch mode (V_(11)),the nominal benzene ring stretch mode (V_7),accompanied by a moderate degree of motion along the nominal ONO symmetry bend/benzene ring stretch mode (v_(23)),the nominal C-N stretch/benzene ring breathing mode (V_(16)),the nominal CCC bending mode (v_(20)) and the nominal CCH in-plane bending mode (v_(14)).A preliminary resonance Raman intensity analysis was done and the results for nitrobenzene were compared to previously reported results for several nitroalkanes.