Chemical Physics Letters, Vol.403, No.1-3, 198-204, 2005
Photoionization dynamics of an aqueous iodide solution: the temperature dependence
We report on the electron photodetachment dynamics after excitation at 242 nm of the lowest charge transfer state of aqueous I(-)at solution temperatures of 25, 50 and 75degreesC. A first intermediate is observed that builds up with a time constant of 220-180 fs in the investigated temperature interval and is assigned to an iodine:electron pair in a transient solvent configuration. Subsequent solvent reorganization leads to a quasi-equilibrated hydrated atom:electron pair (I:e(-))(hyd) that builds up with a time constant of 700-540 fs at 25-75degreesC. The following relaxation seems to be governed by partially diffusion-controlled recombination of the electron in the presence of an attraction potential well with depth of about 850 cm(-1). (C) 2005 Elsevier B.V. All rights reserved.