Picosecond photofragment spectroscopy. IV. Dynamics of consecutive bond breakage in the reaction C2F4I2 -> C2F4 + 2I

Article abstract of DOI:10.1063/1.458469

Picosecond photofragment spectroscopy of the ultraviolet (UV) photodissociation of 1,2-diiodotetrafluoroethane reveals consecutive breaking of the two C-I bonds.Spin-orbit excited (I^*) atoms show a prompt rise, in agreement with a direct mode dissociation of the first bond.Ground-state (I) atoms show a biexponential buildup, one component being fast (<*>1 ps) while the other component is slow (30-150 ps depending on total energy), characteristic of the second bond breaking.The transient behavior of I atoms changes with the available energy.These results are interpreted in terms of a two step model involving a weakly bound radical.Simulations of transient behavior of I atoms, based on estimated internal energy distributions from the primary step and a model for dissociation rates as a function of energy, suggest that surface crossings are relevant to the dynamics and that the quantum yield of I atoms varies with excitation energy.

Full text of DOI:10.1063/1.458469

Picosecond photofragment spectroscopy. IV. Dynamics of consecutive bond
breakage in the reaction C2F4I2→C2F4+2I
Lutfur R. Khundkar and Ahmed H. Zewail
Citation: The Journal of Chemical Physics 92, 231 (1990); doi: 10.1063/1.458469
View online: http://dx.doi.org/10.1063/1.458469
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/92/1?ver=pdfcov
Published by the AIP Publishing
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