Photodissociation dynamics of cumene hydroperoxide at 248 and 193 nm

Photodissociation dynamics of cumene hydroperoxide at 248 and 193 nm produc ing (C6H5)(CH3)(2)CO (CumO) and OH fragments has been investigated by measu ring laser induced fluorescence spectra of the OH fragments, which are prod uced exclusively in the ground electronic state. The measured energy distri butions among the fragments are f(r)(OH) = 0.03, f(t) = 0.49, f(int)(CumO) = 0.48 and f(r)(OH) = 0.03, f(t) = 0. 18, f(int)(CumO) = 0.79 at 248 and 19 3 nm, respectively, and negligible vibrational excitation in OH was observe d at both wavelengths. At 248 nm, slightly negative mu -v and positive v-J vector correlations were observed by analyzing the Doppler profiles of the rotationally resolved OH spectra, whereas no vector correlations were obser ved at 193 nm. From the measurements, detailed photodissociation dynamics o f cumene hydroperoxide is discussed compared to the case of tert-butyl hydr operoxide previously studied.