Abstract
A time-resolved study is presented of the photodissociation of methylene iodide (CH 2I 2) to produce a carbene diradical and molecular iodine. This reaction pathway occurs only at high excitation energies (vacuum ultraviolet) and is initiated in this case by a two-photon transition at λ equivalent = 155 nm. Discrimination over competing pathways is achieved by wavelength-selective monitoring of the nascent I 2 dynamics. The results show clear evidence that breakage of the two carbon-iodine bonds and formation of the iodine-iodine bond is concerted. The reaction takes place in less than 100 fs and is characterized by coherent vibrational motion in the iodine molecule.
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