Mechanism and dynamics of azobenzene photoisomerization |
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| Authors: | Schultz Thomas Quenneville Jason Levine Benjamin Toniolo Alessandro Martínez Todd J Lochbrunner Stefan Schmitt Michael Shaffer James P Zgierski Marek Z Stolow Albert |
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| Affiliation: | Steacie Institute for Molecular Sciences, National Research Council of Canada, 100 Sussex Drive, Ottawa, Ontario, Canada K1N 0R6. |
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| Abstract: | The excited-state dynamics of trans-azobenzene were investigated by femtosecond time-resolved photoelectron spectroscopy and ab initio molecular dynamics. Two near-degenerate pipi* excited states, S2 and S3,4, were identified in a region hitherto associated with only one excited state. These results help to explain contradictory reports about the photoisomerization mechanism and the wavelength dependence of the quantum yield. A new model for the isomerization mechanism is proposed. |
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