Temperature dependent solvation dynamics of electrons after one-photon detachment in aqueous iodide

H. Iglev; A. Trifonov; I. Buchvarov; T. Fiebig; A. Laubereau

doi:10.1117/12.605137

3 June 2005 Temperature dependent solvation dynamics of electrons after one-photon detachment in aqueous iodide

H. Iglev, A. Trifonov, I. Buchvarov, T. Fiebig, A. Laubereau

Proceedings Volume 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy; (2005) https://doi.org/10.1117/12.605137
Event: OPTO-Ireland, 2005, Dublin, Ireland

Abstract

The electron photodetachment from 2.5~mM aqueous iodide solution is studied in the temperature range 25 to 75°C. The dynamics following excitation of the anion at 242~nm into the lowest CTTS state are studied in the spectral range of 400-1000~nm. A first intermediate is observed that builds up with a time constant of 220 to 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. The latter builds up with a time constant of 700 to 540~fs going from 25°C to 75°C. 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. The experimental result for the lifetime of the hydrated I:e^- pair is 21 to 16~ps going from 25°C to 75°C.

Citation Download Citation

H. Iglev, A. Trifonov, I. Buchvarov, T. Fiebig, and A. Laubereau "Temperature dependent solvation dynamics of electrons after one-photon detachment in aqueous iodide", Proc. SPIE 5826, Opto-Ireland 2005: Optical Sensing and Spectroscopy, (3 June 2005); https://doi.org/10.1117/12.605137

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