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We have investigated the photodissociation of CS2 at 193 nm using the technique of photofragment translational spectroscopy. The utilization of vacuum ultraviolet synchrotron radiation for product photoionization has permitted a determination of the vibrationally resolved translational energy distribution for the CS+S(1D) channel and the translational energy distribution for the CS+S(3P) channel. A simulation of the coincident S(1D) translational energy distribution is consistent with a CS vibrational distribution of 0.02:0.17:0.19:0.46:0.15 in ν=0:1:2:3:4 and an average rotational energy of ∼1–3 kcal/mol. We find that the S(3P)/S(1D) branching ratio is 3.0±0.2, in good agreement with previous reports. Both asymptotic channels exhibit similar velocity dependent anisotropy parameters that decrease with decreasing translational energy release. The results extend earlier reports and provide further insight into the dissociation dynamics at 193 nm.

Photofragment translational spectroscopy with state-selective “universal detection:” The ultraviolet photodissociation of CS2