Dynamics of dissociative photodetachment in cluster anions: O4- and O2-H2O

Robert E. Continetti; Christopher R. Sherwood; Mark C. Garner; Karl A. Hanold; Karen M. Strong

doi:10.1117/12.220836

18 September 1995 Dynamics of dissociative photodetachment in cluster anions: O₄^- and O₂^--H₂O

Robert E. Continetti, Christopher R. Sherwood, Mark C. Garner, Karl A. Hanold, Karen M. Strong

Proceedings Volume 2548, Laser Techniques for State-Selected and State-to-State Chemistry III; (1995) https://doi.org/10.1117/12.220836
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

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, D_O 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.

Citation Download Citation

Robert E. Continetti, Christopher R. Sherwood, Mark C. Garner, Karl A. Hanold, and 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); https://doi.org/10.1117/12.220836

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