Issue 43, 2010

Time-resolved photoelectron spectroscopy of solvated electrons in aqueous NaI solution

Abstract

Time-resolved photoelectron spectroscopy was used to study the energetics and dynamics of solvated electrons in aqueous solution. Solvated electrons are generated by ultrafast photodetachment in a 100 mM aqueous NaI solution. Initially, an ensemble of strongly bound (“cold”) solvated electrons and an ensemble of weakly bound (“hot”) electrons in an unequilibrated solvent environment are observed. We report an ultrafast recombination channel for the “hot” electrons with a rate of (800 fs)−1 which is in competition with thermalization occuring with a rate of (1.1 ps)−1. The thermalized electrons recombine with the iodide radical with a rate of (22 ps)−1. About 35% of the thermalized electrons escape geminate recombination and form free, solvated electrons. The vertical detachment energy for the solvated electron is determined to be 3.40 eV. No indication for a surface-bound electron at lower binding energies was observed.

Graphical abstract: Time-resolved photoelectron spectroscopy of solvated electrons in aqueous NaI solution

Article information

Article type
Paper
Submitted
10 Jun 2010
Accepted
03 Sep 2010
First published
30 Sep 2010

Phys. Chem. Chem. Phys., 2010,12, 14629-14634

Time-resolved photoelectron spectroscopy of solvated electrons in aqueous NaI solution

A. Lübcke, F. Buchner, N. Heine, I. V. Hertel and T. Schultz, Phys. Chem. Chem. Phys., 2010, 12, 14629 DOI: 10.1039/C0CP00847H

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