|
Publications
|
|
||
| |
||
|
||
| ||
|
|
"Real time observation of the photo-Fries rearrangement" S. Lochbrunner, M. Zissler, J. Piel, E. Riedle, A. Spiegel, and T. BachJ. Chem. Phys. 120, 11634 - 11639 (2004) Abstract: The photo-Fries rearrangement of 4-tertbutylphenyl acetate dissolved in cyclohexane is investigated by two-color femtosecond pump probe spectroscopy. The spectral transmission changes are characterized in the visible and UV spectral region and allow for the first time to temporally resolve the primary reaction steps. We find that the photo induced homolytic cleavage of the C-O-bond occurs within 2 ps and that the geminate recombination of the gen-erated radical pair to the intermediate substituted cyclohexadienone takes 13 ps. The experimental results support a model in which the initial reaction proceeds from the originally ex-cited ππ*-state via a barrier to a dissociative πσ*-state. BMO authors (in alphabetic order): Stefan Lochbrunner Johannes Piel Eberhard Riedle Martin Zißler Order Hardcopy  WWW-Version |