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Published November 15, 1988 | Published
Journal Article Open

Femtosecond real-time probing of reactions. II. The dissociation reaction of ICN


Experimental results obtained for the dissociation reaction ICN^*→[I⋅⋅⋅CN]^(‡*)→I+CN using femtosecond transition‐state spectroscopy (FTS) are presented. The process of the I–CN bond breaking is clocked, and the transition states of the reaction are observed in real time. From the clocking experiments, a "dissociation" time of 205±30 fs was measured and was related to the length scale of the potential. The transition states live for only ∼50 fs or less, and from the observed transients we deduce some characteristics of the relevant potential energy surfaces (PES). These FTS experiments are discussed in relation to both classical and quantum mechanical models of the dynamical motion, including features of the femtosecondcoherence and alignment of fragments during recoil. The observations are related to the radial and angular properties of the PES.

Additional Information

© 1988 American Institute of Physics. Received 12 July 1988; accepted 11 August 1988. This work was supported by AFOSR (Grant No. 87-0071). Contribution No. 7814. We wish to thank the referee of this and the previous paper for a thorough and comprehensive review.

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