Mode-Dependent Fano Resonances Observed in the Predissociation of Diazirine in the S1 State


  • This work was supported by National Research Foundation (KRF-2005-070-C00063, 2009-0053131 & C00401). The support from the center for space-time molecular dynamics (2009-0063163) is also appreciated. S.L. thanks the Ministry of Education, Science and Technology (Converging Research Program, no. 20090093679).


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Lights, spectrometer, action: Crucial information about the detailed shape of the potential-energy surface in the vicinity of the transition state is obtained from the Fano resonances in the photodissociation cross-section of diazirine in the S1 state. The excitation along the asymmetric C[BOND]N stretching mode accelerates the ring-opening reaction, suggesting that two C[BOND]N bonds of the excited diazirine break in a stepwise manner (see scheme).