Photodissociation Processes in Molecular Beams PDF Download

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A description is presented of a study of the photodissociation dynamics of molecules in a molecular beam. Photo-fragmentation translational spectroscopy has been utilized to observe the photodissociation dynamics of ozone. Using a supersonic molecular beam and a 10 nanosecond pulsed laser at lambda = 266 nm, the velocities of the fragment products are measured by the method of time of flight. The resolution of the time of flight spectrum of ozone is sufficiently high that the electronic and vibrational states are clearly resolved and identified. Above the threshold (lambda 310 nm), the quantum yield for the production of O(1D) has been estimated in the past to be unity for the process O3 (1A1) + h.nu.)lambda 300 nm) .--. O3(1B2) .--. O2(1.delta./sub g/) + O(1D). However a small production of O2 (3.sigma./sub g/−) + O(3P) has been observed in this study. The O2(1.delta./sub g/) product yields four vibrational states (v = 0, 1, 2, 3) which yields a vibrational temperature of 2700°K along with narrow energy distributions of rotational levels. These energy distributions are compared with photodissociation models along with the polarization dependence of the dissociative process which was also measured. 143 references.