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Issue 20, 2014
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Gas phase dynamics of triplet formation in benzophenone

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Benzophenone is a prototype molecule for photochemistry in the triplet state through its high triplet yield and reactivity. We have investigated its dynamics of triplet formation under the isolated gas phase conditions via femtosecond and nanosecond time resolved photoelectron spectroscopy. This represents the complete evolution from the excitation in S2 to the final decay of T1 to the ground state S0. We have found that the triplet formation can be described almost as a direct process in preparing T1, the lowest reacting triplet state, from the S1 state after S2 → S1 internal conversion. The molecule was also deposited by a pick-up technique on cold argon clusters providing a soft relaxation medium without evaporation of the molecule and the mechanism was identical. This cluster technique is a model for medium influenced electronic relaxation and provides a continuous transition from the isolated gas phase to the relaxation dynamics in solution.

Graphical abstract: Gas phase dynamics of triplet formation in benzophenone

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The article was received on 28 Jan 2014, accepted on 04 Apr 2014 and first published on 07 Apr 2014

Article type: Paper
DOI: 10.1039/C4CP00423J
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Citation: Phys. Chem. Chem. Phys., 2014,16, 9610-9618
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    Gas phase dynamics of triplet formation in benzophenone

    G. Spighi, M. Gaveau, J. Mestdagh, L. Poisson and B. Soep, Phys. Chem. Chem. Phys., 2014, 16, 9610
    DOI: 10.1039/C4CP00423J

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