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Tuning the ion formation processes from triplet-triplet annihilation to triplet-mediated photoionization

Published inChemical physics letters, vol. 378, no. 1-2, p. 185-191
Publication date2003
Abstract

Free ion formation in acetonitrile is examined through transient photoconductivity for a set of ketones excited at different wavelengths. According to the photophysical parameters of the ketones and the incident photon energy, two mechanisms can be operative: triplet–triplet annihilation (bimolecular process) and/or photoionization (monomolecular biphotonic process). By using a tunable laser, excited state mediated photoionization was studied. From the threshold energy (E[thr]) required for this process to occur, ionization potentials in solution (I[S]) were deduced and compared to the corresponding values in gas phase (I[G]). A simple energetic model enables the determination of the oxidation potential (E[ox]) of the ketones that are compared to the corresponding values obtained through electrochemical measurements.

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JACQUES, P. et al. Tuning the ion formation processes from triplet-triplet annihilation to triplet-mediated photoionization. In: Chemical physics letters, 2003, vol. 378, n° 1-2, p. 185–191. doi: 10.1016/S0009-2614(03)01211-9
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ISSN of the journal0009-2614
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