Wave packet driven dissociation and concerted elimination in CH2I2.

We follow the evolution of a vibrational wave packet in a highly excited state of the halogenated methane CH(2)I(2). We observe how the wave packet modulates both dissociation and concerted elimination to form CH(2)I(+) and I(2) (+), respectively. We present a simple and intuitive interpretation of the molecular dynamics leading to the formation of the products.