Coaxial measurement of the translational energy distribution of CS produced in the laser photolysis of CS2 at 193 nm

• Published in: The Journal of chemical physics 1985-10, Vol.83 (7), p.3481-3490
• Main Authors: Mccrary, V. R., Lu, R., Zakheim, D., Russell, J. A., Halpern, J. B.
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Exact sciences and technology; Inorganic And Physical Chemistry; Molecular properties and interactions with photons; Photon interactions with molecules; Physics
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.449152

Carbon disulfide (CS2) photolysis was investigated in the gas phase using an argon fluoride (ArF) laser at 193 nm. The coaxial time-of-flight (TOF) distributions of CS radicals produced in the photolysis have been measured. Photochemical fragments have been observed with translational energies below 3 kcal/mol. The vibrational distribution of the CS fragments was also probed by laser induced fluorescence (LIF), and these measurements confirm that significant amounts of CS radicals are produced in vibrational levels greater than v″=6. From a computer simulation of the experimental LIF data, a vibrational distribution was also obtained. Vibrational levels up to v″=12 were found to be populated in a bimodal distribution, which peaks at v″=4, and extends to v″=12. There was a significant amount of rotational excitation of nascent CS produced in high vibrational levels of the ground state. The disjoint translational energy and CS vibrational energy distributions can be used to obtain an estimate of the S(3P) to S(1D) ratio of 0.66.