18 September 1995 Dynamics of dissociative photodetachment in cluster anions: O4- and O2--H2O
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Abstract
A preliminary report is presented on experiments using fast ion-beam translational energy spectroscopy to study dissociative photodetachment and photodissociation dynamics in the small cluster ions O4- and O2-(DOT)(H2O). Translational energy and angular distributions of coincident molecular fragments were recorded from the photodestruction of O4- and O2-(DOT)(H2O) at 523, 349, and 262 nm. At each wavelength, the O4- results confirm the existence of at least two distinct channels: dissociative photodetachment (O4- + h(nu) yields O2 + O2 + e-) and photodissociation (O4- + h(nu) yields O2 + O2-). Observation of strongly anisotropic angular distributions shows that dissociation occurs on the time-scale of molecular rotation in both processes. The photodissociation of O4- at 523 nm gives a new value for the O2-O2- bond energy, DO equals 0.39 +/- 0.05 eV. In O2-(DOT)(H2O), a single dissociative photodetachment channel (O2-(DOT)(H2O) + h(nu) yields O2 + H2O + e-) is observed at all wavelengths. Angular distributions from this process are slightly anisotropic and exhibit a small wavelength dependence.
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Robert E. Continetti, Christopher R. Sherwood, Mark C. Garner, Karl A. Hanold, Karen M. Strong, "Dynamics of dissociative photodetachment in cluster anions: O4- and O2--H2O", Proc. SPIE 2548, Laser Techniques for State-Selected and State-to-State Chemistry III, (18 September 1995); doi: 10.1117/12.220836; https://doi.org/10.1117/12.220836
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