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Title

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

Authors
Jacques, P.
Allonas, X.
Sarbach, A.
Haselbach, E.
Published in Chemical Physics Letters. 2003, vol. 378, no. 1-2, p. 185-191
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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Research group Groupe Vauthey
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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. https://archive-ouverte.unige.ch/unige:3704

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Deposited on : 2009-10-06

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